727 Transgo shift kit. Plugging tiny hole in valvebody partition

I use JB Weld on lots of things, but inside a valve body would worry me that a piece could flake off and jam a valve. How about a little strip of solder; crimped or smashed on both ends? Or maybe a tiny finishing nail chopped off and crimped? That's what I use on th400 separator plates to dual feed the direct clutch; have to block the reverse feed hole.