I'm going to check out my options during my "hiatus". And I'll check into the CRA per Saundra Duffy's suggestion. I just know I'm not working for the G.O.P./Central Committee anymore.
When you check into the CRA, ask them if any Jews are welcome as candidates. Also, make sure you read the NFRA and Vanguard links.
In addition to the CRA, there's also the
RLC (Republican Liberty Caucus). They endorsed Tom this year, too.
I considered switching to GOP last year because I was interested in the RLC platform. I didn't want to reregister, though, because I like the anonymity (in public records) of not having any party affiliation.
Good luck with whatever decision you make!