If you make your pets and guests the main source of the character's damage and focus your weapon attacks on effects and beast-boosting, it'a a viable build. As a matter of fact, after you max out Dex and Cha, I'd even suggest shifting your remaining points from Str to Int - not to cast spells, but to support mp-exclusive guests such as Doomquake Minions and Memet.
Accept that you're not going to have a full elemental coverage - embrace the fact and freely use Prime Chaos Orb to shift monster's resists to whatever is convenient for you. Furthermore, you have access to Neko Claw - a 2x damage skill that uses Cha as Mainstat and seeks between 2 elements. Pair it with the Orb and the only remaining reason to use weapons is for nifty effects or resource preservation.
Moglin Fan from the Murderator Challenge uses Cha as MainStat instead of Str or Int. It's random element and sacrifices a notable portion of damage to inflict either Control or Prismatic Burn.
Fresh Astracenae, the only other Cha-based weapon I know of, sacrifices damage to make your guest attacks deal +15% damage.
Your Foam Finger has a toggle to make your pets and guests deal +25% damage - great synergy with BoW.
Lance of Rose's thorn uses Dex to inflict a powerful bleed.
Stun Bow has a toggle to sacrifice 50% damage for a chance to inflict paralysis. Pair it with Frostgale's Remorse misc, and you get a pretty nice set-up.
Zardwards Wand has ImperiOW - an attack that sacrifices all your damage to inflict the monster with Control.
Any tome can be used for its mp regen function.
Aside from Nekos, BoWs and Lord of Thunder, I can only suggest War's Legacy armor, specifically for the Panic skill. It uses your turn (at no sp cost) to inflict the monster with a 4 turn stun chance, using Cha as MainStat.
Since you will have no real need of the CIT, you can replace it with Pies for the Cha drive.
Kindred shield has a chargable qc sp/mp regen, making it a better choice than Fruitcake.
Scarab Shell has a toggle to lower monster MRM, increasing the accuracy of not just yourself, but your pets and guests as well.
Since the main damage infliction of the build shifts to your guests, you may want to focus on that. As with weapons, there's no real need to cover every element - Chaos Orb takes care of that. Instead, focus on the few elements that really have powerful guests:
- Mogsterio is slightly better than Cherub on the acount of being MC'd.
- Grimlord deals double damage.
- Doomquake Minions - the first reason to run Int, a guest that deals 2x damage for 2x mp upkeep.
- Memet - the other reason to run Int, the only harm guest in the game.
- Shadowscythe Floater deals 3x damage during first turn. Use it, then switch resists using Prime Chaos Orb.
- Dread Fiend of Nulgath is great for niche backlash builds - SleepyQrowKhaiin is currently warring with that set-up.
There's also the options of Hedgemog (token), Shogun&Ansatsu (premium) and Pyre Rat (seasonal), but they feel like a lot of expense for a minor benefit.
Otherwise, just get a healing spell (like Your Body Heals at the Speed of Light or Sisters of Mercy), effect spells like Moonwalker's Grace or Thorns, and Cha-based damage spells like Scarab Swarm and Moglord War Party.
As with other sources of damage, you don't really need to cover every element, just get the ones that complement your guests:
- Gilded Deatharrows Cat works great with Mogsterio and any light nuke you use.
- Model 294 does the same for Grimlord and your darkness Claw.
- Morningstar pet can inflict DefLossor EleVuln, fulfilling the same function for Minions.
- My Tiny Void Pwny is a harm pet.
- Underwyrmling has great utility, being the only pet that can harm sp.
Essence Orb gives resources for nukes and guest upkeep.
Goggernaut Helm is still great, giving +10 bth to spells, pets and guests.
Prime Chaos Orb allows you to switch around monster resists and boosts the damage of your spells,pets and guests to a pretty noticable degree.
Shadowfeeder Pendant is very useful for every element not covered by BoW.
Murderator Gauntlet gives Int for extra mp, Cha for bonus accuracy and damage, and a chance to inflict control.
Morningstar Helm gives immunity to paralysis. If you want something a little more sp-efficient, Blood Ruby and Liquid Courage give resistances to paralysis and fear respsectively.
Frostgale's Remorse gives paralysis potence (pairs great with Stun Bow), or you can go for Taladosian Pendant to increase effect chances of your wand's Imperiow or War's Panic. Then there's generic Cha-boosting miscs like Yasakani Jewel or Waffle Cone.
Hope the info's useful and don't hesitate to ask if you have any questions!