Crestron systems don't work that way. You won't be able to throw a third party solution at it. The easy solution is to purchase a replacement remote of same model and do a direct replacement.

Depending on model/etc you'll need to:

-enroll on RF / wifi and set RF-ID or IP-ID
-load .vtz or other project file specific to remote

Both of which will require Crestron Toolbox, some basic info about the system config. For the second you'll also need an up to date copy of the relevant project files.