I have also been thinking of trying something like that as well.
Was looking at the Ruger 22/45 but it has only a 10 round mag. The 1911 grip is a plus ++ for me.
30 rounds is nice too.
The PMR 30 is a .22 magnum. There is a long waiting list but sometimes you can find an FFL dealer selling a new one in the box on Gunbroker.com.
I waited a year and a half on backorder at Impact.