Well there is the Park FR-FH, but I couldn't find it on the Park website, maybe it's discontinued.

So when you heated and pressed, did that create grooves in the plastic to hold the tool really firmly? I have a bike that I have never been able to get the lockring off, I've tried standing on the wrench (and holding the chain-whip at the same time), no go. I think at an extreme like that, a plastic tool would break, but for a lot of cases, that seems like a great idea.

EDIT: joejack found it. I was looking for fr-Fh instead of 5h, because of typo on treefortbikes.com.