My goal is to get more of this good DOS and early Windows educational software working for my children.

FYI, you can play in the browser on Internet archive: /msdos_Super_Solvers_Spellbound_1993

That meets your stated goal.

A more fun solution might be a Mister. If you're unfamiliar, it's like a hardware emulator. I've been playing gizmos and gadgets on it. If you really want the feeling of swapping disks, I have my Mister installed in a Macintosh iisi case asking with an nfc reader. I put nfc tags on old blank floppies so that when I insert the disk into the case, the nfc reader reads it and software (zaparoo) loads the game based on the tag...