That's easily done with the FPGA, once it's there.
sure, but if you separate the 'loading' and the 'driving' functions to two devices, the 'driving' function will never have a timing problem because of some circumstance in the 'loading'.

I am, still being cost conscious, in favor of separating functions to separate units. The cost of having to fix umpteen units in the field because you found that a timing glitch had shown up with your last enhanecement is far highte than $3 in the initial manufacture of the unit.

The risk of being cost conscious in the wrong place (this does not apply to toys) is that a 'savings' not fully and totally thought through may come back, possibly after years, to bite you in your largest muscle.

Erik