I just checked the keyconv code again. It doesn't need boost. It's roughly a dozen lines of code that mostly use openssl fucntions,

EC_KEY_get0_private_key
EC_GROUP_get_order
BN_mod_add

and a few init/free type openssl calls.

So it should be straightforward. Once I've got further, assuming I actually go live with this, and have some time, I can write up a function and test it out. Curl should work fine for actually accessing the api. Would you be getting generating keys single or in batches? Batches is far more efficient unless the prefix is long (6-7+ chars).