Hey thanks! I took a step back and reevaluated the situation after Music.app ATE my converted music library. I did some digging and found Retroactive and thus am now running iTunes 12.9.5.5 on Catalina until Apple can rectify its cranial-rectal relationship...
It appears that this has given SizzlingKeys a little more life now and I'm back to enjoying it's full and robust functionality until Apple finally get's things right. Overall I'm finding SizzlingKeys to be even more responsive / faster with iTunes at playing and acting on key input than Alfred was in my initial go with Music.app.
I'm sure I'll be back down the road once the Apple-ocalypse has gone past the event horizon...