Well it's done now, PM'd it to ya. Theoretically it should work, but I didn't have any actual blacklisted layouts
handy so fingers crossed
These used to be quite widespread, there's loads of crappy 70s-early 80s handheld games using one or a variant of it in MAME . The particular chip used here has the MP0027A program on it, there was a MP0027 as well which I'd imagine is compatible but not 100% sure. I don't think there's anyone just selling the chips by themselves though, so one of those doorbell kits or anything else that happens to have it is needed, no idea about the price. Getting one from a real machine is probably a hard sell, because the decapping process destroys the chip and you can't program new chips either, TI didn't make any blank versions of these.
Yeah emulating the TMS1000 is no problem, MAME has many things that use it already, the obstacle here is finding a chip with that specific music program in it and sending it to someone with the necessary skills & equipment to get it dumped.