Sorry for the late reply!
Crypto is already fully Latinized by changing the k to a c. It doesn't really clash, and choosing another non-borrowed Latin word would just be confusing, as it would bring in words with other connotations, like caecus (blind), clandestinus (clandestine), furtivus (thief-like), latebrosus (lurking), and such.
Just use crypto.
For the record, I like Cryptomoneta Credimus.
Thanks for your input, I do like Cryptomoneta Credimus !