A slightly modified pimoroni heatsink case might be a step in the right direction?
Aside from a booster-header, i used 40mm M3 bolts instead of the default M2.5. so i carefully widened the holes in the PI, drilled through the heatsink-case-top (very close to the heatsink edges), and widened the original middle case-standoffs. The pisound itself and topcover are untouched.
I suppose the pisound case-bottom and -sides could be made to fit, maybe with room for a fanshim variant that doesn’t use gpio?