Guys, I figured out how to .rel port over the Ice Climbers! It's not that hard, but you have to have a code that changes each Ice Climber slot to a Popo-only slot. Nana-only won't work either. It has to be specifically Popo solo, but once that is done, .rel porting works perfectly.
Here's the specific code you need, before the IC-constants, ported .rel, and soundbank codes:
Character/Costume Replacement (Ice Climbers - Popo) [spunit262]
* 80000000 90180B48
* 80000001 90180BF8
* 60000003 00000000
* 4A001000 00000000
* 38000002 00FF1000
* 4A001001 00000000
* 38000004 FF000000
* 10000000 00000011
* 100003C5 00000000
* E0000000 80008000
* 4A001000 00000000
* 38000002 00FF1000
* 4A001001 00000000
* 38000004 FF000001
* 10000000 00000011
* 100003C5 00000001
* E0000000 80008000
* 4A001000 00000000
* 38000002 00FF1000
* 4A001001 00000000
* 38000004 FF000002
* 10000000 00000011
* 100003C5 00000003
* E0000000 80008000
* 4A001000 00000000
* 38000002 00FF1000
* 4A001001 00000000
* 38000004 FF000003
* 10000000 00000011
* 100003C5 00000004
* E0000000 80008000
* 4A001000 00000000
* 38000002 00FF1000
* 4A001001 00000000
* 38000004 FF000004
* 10000000 00000011
* 100003C5 00000002
* E0000000 80008000
* 4A001000 00000000
* 38000002 00FF1000
* 4A001001 00000000
* 38000004 FF000005
* 10000000 00000011
* 100003C5 00000005
* E0000000 80008000
* 86000000 00000004
* 86000001 0000005C
* 62000000 00000000
Feel free to yell at me if the costumes are wrong, btw. If this character/costume replacement code can also work with a Nana-only CSS slot, I can test the ft_roy Clone Engine codes. But for now, by changing Ice Climbers to Popo alone you can .rel port like any other character.
Soo... since PAL .rels are now availabe... what exactly needs to be done for this to work for PAL?
I really, really doubt that the generic Ike .rel will work on PAL. But, the standard PAL offsets seem to match the ones on Dantarion's wiki so Marth and Jigglypuff's might work. And Metaknight if the no entry/results code gets ported to PAL.