From my reading, R7RS does not support quasiquoted u8vectors either, the
formal grammer refers to "<qq template>" which seems to be allowed to
be only a list, a vector or a datum, the latter not being processed any further.
I hope this makes sense.
It does, thank you for explaining Felix. From my understanding, if you want to construct u8vectors mixing and matching expressions and raw literals then the run-time constructors is your only option. And this seems to be intensional by the language designers then.
K.