Thanks for taking the time to put this together!

I got all the way up to "converting the result with Base58Check", thats where you lost me.

I did review https://en.bitcoin.it/wiki/Base58Check_encoding but again, ended up feeling like it was greek.

This has been a good exercise, and I will continue learning about the cryptography, but I'm really looking for something the average guy can use (i.e. me) to easily assemble Shamir's Secret Sharing keys into a Bitcoin WIF private key, does this not exist?