I was looking to get someone to do a provably fair tool, preferably browser plugin, or do it myself, that you could verify as you play on any site.

It's odd that you would start with BetCoin.tm and some of the other places you have instead of the dice sites, you can see a list here dicesites.com, since most actual Bitcoin casinos are not provably fair or use a pretty bad method. (I can't speak for Betcoin.tm, never checked).

I'd recommend looking at dicesites.com, Nico has verifiers for most of the biggest dice sites and very good tutorials about provably fair.

Be good if you can then add BetKing.io.