If I recall correctly, Trinity1 allowed hoykey assignments visually onto the Bars you added, of directly to the spell book icons.

I do not recall being able to assign the same hotkey to execute the same spell, or to 2 or more buttons.

I have yet to try Bongos. It took my over 2 months to get familiar with the ins and outs of Bartender.

I think I started with Trinity bars included in the Insomniax UI Mix.