Belinda- Run. Run away as fast as you can.
Often clip earrings are clip on because they are too big to hang
properly with just a post. I have seen way too many lovely old
costume pieces ruined by conversion. They just flop forward on the
The enamel is probably plastic and will burn the nano second you
take a torch to it. Earrings of that sort are also mostly plated pot
metal with a melting point of about 600F. You can melt them with a
Sterling posts often irritate pieced ears.
With out seeing the earrings…
The most you might be able to do is to glue on a stainless post with
a large glue pad. Leave the clip on, loosen the clip a little, drill
a hole in it for the post to go through so that the clip will help
keep the earring upright on the ear.
Have fun and make lots of jewelry.