Martial Arts charge-up question

My searches have failed me so question for the room: is

Charge-up damage based on when it was charged or when it is triggered? ie, if I use a claw/shield to build charges then switch to dual Mosaic to trigger them, will their damage be based on the original claw or will the plus skills/elemental % on Mosaic still apply?

I play with a controller and it is frankly too many buttons so I'm wondering if building charges with a second weapon set is viable or if I'll just have to forego some skills. Has this been tested?

In theory, the weapon for charging up doesn't matter as your finisher determines the base damage.

Dragon Claw is using your

Claws while the others are using the boot's kick damage.

I just tested for your assumption anyway and charged with my cta but guessing the precise damage output from what happens on screen is very difficult because even with only 1

Charge of any of the skills I one shot most mobs... But I can definitely confirm that charging up with your swap weapon and then switching back to Mosaic to realease charges works just fine.

Awesome, thanks for testing it out!