[ehsankia]

As with any sort of big transition (changing e-mail, using a new password manager, changing programming language), the solution is always to do it incrementally.

For e-mail, I generally create a new one, and over a year or two, I create new accounts with the new e-mail and gradually move accounts until the old one is seldom used. Similarly here, it may be a bit tricky, and it really depends on how intertwined it all is, but gradually writing new pieces that you're adding in a new language, or using C++ for pieces that you're rewriting. eventually you'll be much closer than trying to do it all at once.

[andai]

This gradual approach is what Mozilla is doing with transitioning Firefox to Rust. Parts of Firefox are already written in Rust.