@nm0i
keyd worked perfectly! Among all things this MBP has a buggy trackpad and that has to be worked around by loading the Broadcom kernel module early after that both KB and pointer are presented as a single event device file, but luckily keyd has a mask to filter out mouse/pointer events.
I still have my sway/wtype-based workaround in place just in case — but so far so good, works even outside graphical sessions now 😁
@m0xee Give a glance to kmonad as well, both are in void's default repo.