Has anyone not used the factory handlebar controls on their build. I have tried several and I am not getting enough throw to disengage the clutch.

I would rather not use the bulky factory grips/switches

You can use any switches you like, providing you are willing to make the changes to the wiring loom and are not worried about losing the auto-cancel for the indicators.You will also need to make new throttle and fast-idle cables. See here:-

https://www.k100-forum.com/t10150-wiring-in-non-bmw-handlebar-switches

Currently I have a Triumph Sprint switch cluster on the left and a Suzuki Bandit 1200 switch cluster on the right. The clutch perch is from a Moto Guzzi California Stone and the front master cylinder is from a Moto Guzzi California 1100ie.

Switches are not a problem. I am looking for the perches themselves. SO far just the MotoGuzi

If you still have the narrow OEM bars on then 70s-80s Honda with the built-in perch is your only choice. Nothing else will let you route the clutch cable properly. I've raised my bars by 25mm which gave just enough clearance for the Guzzi perch to clear the instrument panel. I also forgot to add that the BMW bars are 22mm in diameter but everybody else uses 7/8-inch. That's marginally larger than 22mm by just enough that non-BMW, plastic switch clusters will not clamp up tight. The only answer to that is to figure out where you want the switches and then drill the bars to accept the metal peg that should be in the switch housing. The cast-alloy Honda ones will clamp up tight enough to not rotate.

I am wanting to use clip ons so I can use 7/8 bars or 22mm, which ever works out.