I just read through the GRCC Student Code of Conduct online and it doesn't have the exception like the UW does for "constitutional rights"... That means you're pretty much hosed.
Sending that letter will get you a LOT more attention than you want. Your best bet, honestly, is to conceal and keep it concealed and hope you're not caught. Just remember that what you're doing isn't illegal, but it is something that could get you kicked out of school. Is it right?... Certainly not, but until we get HB6860 passed, you're just going to have to either risk expulsion/disciplinary action or not carry on campus.:?