its safe to install any system menu wad via wadmanager as long as you instal the relavant ios first then the system menu wad.
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check out this link. if you want to downgrade/ install ios that matches the system menu you want to go to/ then install the system menu you want to go to
so for pal 3.2
it would be ios 30
followed by sys menu 290.
i do it all the while, it like having a wormhole across the ninty galaxy.
BUT BEWARE!!! YOU COULD KILL YOUR WII!!!!!!
IF YOU DO THEN DONT BLAME ME!!!!!
if you have bootmii as boot2 and a nand backup you cant go wrong.
IF YOU HAVE A LU64 IGNORE ME