As Oregon is NOT a "stop and ID" state, the ID is a non issue. You do NOT have to provide ID even if they have legitimate RAS. I simply don't carry ID, leaving it in my vehicle when park.
Now the CHL is another animal and I don't have an answer for you about how it REALLY works.
In THEORY, they need RAS to detain you (in order to demand the CHL) and the mere possession of a weapon wouldn't give that RAS. There is "no firearms exception to the fourth amendment" per the US Supreme Court.
In REALITY it's a pretty good bet that an officer is not going to care and is going to demand your ID and your CHL. The ID is a done deal (not required) but the CHL will ID you and it's unlikely he's going to give up on getting that. HOWEVER, if you want to be a test case, go for it!!
I'll be going through there OC on a motorcycle during the week that includes the 4th so maybe we'll have some "word" on the situation.