I fixed the problem with the 7-in-1 cart, here's the working rom.
Still, i need a mapper 52 script for the other one.

The "decompilation" was referring to CoolX, which pertains to the other games you mentioned (Boogerman II, FDS ports etc.). The Action 52 rips I mostly re-coded myself, and are unrelated to CoolX; there is no full decompiling of Action 52 AFAIK.

Clear.
I once set out to improve the first Cheetahmen, but it didn't go beyond small edits. There is a port of this game on MMC1, I also rewrote the intro for the game based on the intro from the sequel (so that you can skip it and go to the menu with a pause), but the music from the intro of the second part remains in it ("Bossa Nova", if you know).
I also planned to insert an intro at the end of the game so that after the last boss there would be a screens with frames from the Action 52 advertisement, as well as rework the characters and enemies under the 8x16 sprite mode to insert the sprites of the Sega version, but I lack the help of a person who understands machine code or assembler.
By the way. I have trimmed to 48 kilobytes the famous dump of Cheetahmen: The Creation.

I didn't touch much of anything in the "CoolX" mapper hacks in terms of coding, but I would assume anti-piracy measures were disabled. The github page had what seemed to be full decompilations of the ROMs (albeit still in PRG/CHR-like formats, not outright source code); which I unfortunately didn't back up.

I see in your "Streemerz" rip that there's a visible health bar; is that an unused function, or was it custom coded? (I assume the heart graphics themselves are new)

Are you talking about a complete decompilation of all Action 52 games? Is there a link?
Maybe there are still saves on the web archive?
With regard to Streemerz, all games were supposed to have a life bar and a score counter, since the games were made on the principle of a conveyor and have an identical design. But in a number of games, some functions are disabled, and in some cases it was possible to turn platformers into flying games like Micro Mike (I did that once with Haunted Hills) or vice versa. The heart icon is taken from the first Chip and Dale.

Ha! Your Action 52 conversions reminded me of my conversions (some) that I made a long time ago, I attached my collection under the post. Also I had Ninja Assault hack with fixed stage 4.
I'm also pleased with the fact that FDS conversions are still being done. By the way, Boogerman II previously ported Sharpnull. And in games from Ei-Ho Yang, anti-piracy protection is sewn in (I hope you've removed it all, the integrity of the CHR ROM is also checked there).

These are New Dump Carts:

1998 3-in-1 (YH330)
1998 Super VT Game 4-in-1 (VT4226)
1999 Super VT Game 4-in-1 (WQ4214)
4-in-1 (OK-416)
4-in-1 (YH4XX_20210521)
4-in-1 1999 (YH447)
6-in-1 1998 (YH605)
8-in-1 (850848C, GD804_20210509)
AB一族 Well 4-in-1 (AB216)
King Series Super 7-in-1 (S7011)
Super 3-in-1 (K3002)
Super 3-in-1 (K3007)
Super 4-in-1 (MTC0405_20210522)
Super Game 3-in-1 (0333) (KT-8333)
Super Game 3-in-1 (8B2119) (YH-363)
Super Game 4-in-1 (KT-3445AB_20210509)
Super Game 4-in-1 (未知系列_20210520)
Super HiK 6-in-1 (YH6XX_20210520)
Tom & Jerry 4-in-1 (BRC-2_20211029)

Cart Photos & Rom Download Link:
https://www.mediafire.com/file/kdxe0pgyx4qhjqg/ggdjr%2527s_Cart_Dump_Rom_%2526_Photos_20240208.zip/file

Notice:DON'T REQUEST UNRELEASE DUMP MULTICART ROMS! Don't take the ROMs you exchange with others as yours!