I was hoping I could use a universal

I am skeptical that such a URC exists. If you can borrow an original remote, you can teach a "learning" remote each key.

If you cannot find an original remote, there may be a clone remote available. My clone remote only cost me $24 (at Amazon). And I have since downloaded three additional, complete profiles (for free).*

1. URCs do not typically offer complete profiles (though some allow custom programming).
2. Most are geared toward AV/home entertainment, not other types of systems.

*It holds four and I have decommissioned one because it was the incorrect type.

I just looked at an image of the remote.* Its keys do not seem particularly exotic compared to regular AV remotes. If Remotes World has that key profile available, it should be intuitive in their clone remote.

*Pages 33-34 [PDF pages 41-42] in the user's guide,
[Link: downloads.smarttech.com]