I don't even have an fn key, much less an insert, on my hacked-up Chromebook, so I have right-alt set to alt-gr and I mapped alt-gr+enter to insert (and alt-gr+backspace to delete) in my X key map, and, even still, it honesty feels very ergonomic to hit ctrl/shift-insert?

(FWIW, the real problem is that the behavior is inconsistent with respect to what it pastes from :/. Notably, Firefox does something unusual and there has been a bug open for over two decades to fix it... before you say "well then, go submit a patch", someone did, lol omg.)