In theory, yes. "Trivial" is hardly accurate, but it would be relatively easy. Of course, on hardware without Secure Boot enabled, you wouldn't need to do that in the first place; there are ways to disable the signature checks at boot time (but Secure Boot blocks them).
In practice, good look finding anything that *isn't* a Windows RT tablet but which has firmware Windows RT can run on. ARM isn't much like x86, where everything is designed to be compatible with everything else. Even relatively simple ports of open-source OSes (Linux, including Android, for example) are difficult and typically fraught with driver issues. RT is not open source, and is targeted at very specific hardware. Frankly, I would give poor odds of success. Doesn't mean you shouldn't try, if you get the opportunity, but don't hold your breath or expect somebody to do it for you just because it's "easy".
Win8/Windows RT projects:
List of desktop apps for hacked RT devices
Native Access WebServer and Libraries
WP8 Interop Unlocks
Storage Cleanup tool
XapHandler, Root Webserver, OEM Marketplace XAPs, Bookmarklets collection (Find On Page), Interop-unlock hacks.
Do not private message me with questions that should have been posted on the forum!
Not only are you wasting your time - I'm not going to bother writing an answer to such a question for only one person - but I will probably block you from PMing me in the future as well.