Probably it would help a lot but for plot reasons, I assume its body is hidden (?)
I assume Meryem went elsewhere to play Gungi with Komugi so only Palm would know where he is.
Technically there's nothing stopping him from doing that though generally speaking unconditional abilities aren't very unconditional when they would create some serious problems.
At any rate Ikalgo's ability doesn't stop the body from decomposing so he wouldn't be able to use Meryem's body for very long.
simply because the poisent will end up killing him also when making contact for a long time