From your tests, this SMW footer shows that all thats needed is param74. So I don't think anything else from the SMK footer besides the preset ID and maybe rom map param would be required for other games to boot.
Code:
47 02 00 00 11 10 74 06 08 00 00 00 43 61 6E 31 // minimal SMW footer
So a minimal SMK footer would be
Code:
47 02 00 00 BD 10 74 06 63 01 0A 00 00 00 43 61 6E 31 // minimal SMK footer
From what I can tell, that would boot SMK. So editing it from there by changing out the preset ID should be reliable. The only difference between that in the minimal SMW footer are the Preset ID and the rom map byte. So trying the minimal SMW footer with lorom games, and minimal SMK footer with hirom games should be fine for testing other preset ID's in there.
As for interesting PresetID's... hmm.
0x1016 is popular for enabling high res mode in games not officially release on VCs/CCs. Officially that is for Mario no Super Picross, but is popular to use with SD3 too.
0x10EF is for Super Star Wars: Return of the Jedi, but is popular to fix audio issues.
These are probably good to test because they have simply been the most common to be used with multiple games.
Actually. Here are probably my final 2 SFA2 patches to test.
SFA2 Test11
SFA2 Test12
These are going back to using SFA2 E-NTSC's preset ID which was tested before. But what is added now that waent before is the rom map byte set to hirom. Going over my notes, it seems we actually didn't try that before...
Beyond that for testing, not a lot of ID's stand out in particular. Maybe 0x1115. That's for "Kyūyaku Megami Tensei: Megami Tensei I・II", but it's an odd ID that I haven't mentioned to a lot of people. It behaved like a special chip id on SNESC, but as I understand its not a special chip game. In fact its only 1 of 2 ID that will even boot Dungeon Master on the SNESC. Not really sure what I'd expect from it from a test, or what a result would mean. Just mentioning it because its an interesting ID.
Really though, you should probably mostly just test what you feel like. I'd be happy to learn that ANY ID that doesnt belong to a stock game works, and find that productive and useful at this point.