Oh god please no. There's no need to run all the way to the most extreme, craziest ideas possible.

The masses were content with Stormblood Bard, flavor wise. You don't need to do anything more extreme than SB Bard. And all SB Bard was, was a music-themed archer, with some support skills that that provided the second or third-most added raid damage.

That's all they need to do. Keep it as-is, add some ~400-800 dps worth of support via abilities that are interesting and engaging to use, buff the other ranged in turn because all three are behind anyway. Maybe do some QoL cleanup, do something for those poor badping MCHs, call it a day. Easy.