in an online search - the CFADPTHD seems like it's
close to what I'd want,
except it's Compact Flash; I'd have preferred SD but I guess converting
their interface to IDE is more work.
Yeah, I think Compact Flash actually uses the IDE protocol just with a
different form-factor while SD cards are their own thing so a conversion
from SD to IDE is a whole lot more work.
Although, I did find these so I guess you're not the first to want this:
https://www.amazon.com/40Pin-Male-Hard-Drive-Adapter/dp/B01ANIQNK4
https://www.amazon.com/dp/B076597T9H/ref=dp_prsubs_1
https://www.newegg.com/syba-sd-cf-ide-br-ide-to-compact-flash/p/N82E1681218…
https://www.newegg.com/syba-sd-cf-ide-di-ide-to-compact-flash/p/N82E1682299…
https://www.newegg.com/syba-sd-ada45006-ide-to-compact-flash/p/N82E16812186…