I am not sure you are supposed to use a capo with a b bender. Regular telecaster, probably, b bender, it sounds weird to me.
The bender is meant to play licks and fills, if you are going to play rhythm, maybe capoed telecaster ?
I'm curious what capo style or brand works best with a Bender? Are there any you've found work better at keeping the B string in tune?
That's an excellent question, and there's no easy answer.
In theory you'd want something that presses down, but with as little friction as possible, right? Certainly stainless steel frets would help, but I digress.....
I don't own or use a B-Bender, but I've used capos on my electrics forever, and I place them directly on the fret. This gives maximum friction, so DON'T do that.
Are you familiar with the Glider Capo? It was developed by the late guitarist Greg Bennett, and it may work for what you're concerned with. Here's a video of Greg playing & using the glider:
I'm not understanding this topic as to why B or G Benders can't use a capo. IF you play a BAR chord anywhere up the fretboard and pull the B or G, isn't that the same as a Capo ? How does the B or G string know you are using a Capo or BARRING at an upper fret ?
If we play without a CAPO , but yet play off the root "A" position at the 9th fret , which is a hot bed of Bender Heaven, does the B string care ? We are fretting the B string at the 10th fret and then pulling it. Our finger is a capo.
The Bender isn't meant to play "licks or fills" , its meant to play MUSIC executed by the player, whatever it may be. There are no limitations to creativity.
The Capo gives the player an arsenal of OPEN STRINGS in various positions, thats why we would use one, especially in positions under the 5th fret which allows us to use varied root forms with OPEN strings.
My Emmons Steel pulls the same strings, it doesn't much care where the BAR is. 0 fret or 12th fret. Or above the 12th fret.