<to gerrymander a UNIBUS card to work in a Q22-bus slot? Could it be
<feasible to make a UNIBUS to Q22-bus adapter?

You want a qniverter.

Unibus is non-multiplexed, Qbus is multiplexed.  They are physically
and timing wise incompatable.  The board and connector size is DEC STD
and is also the same ans PDP-8 omnibus (also incompatable).

Allison