I doubt they will make different barrel lengths but the again anything is possible. Smith made a revolver that matched what your looking for. The model number escapes me at the moment..
I have three friends who own centerfire LCR's,,,
Two of them have already ordered the .22 LR version,,,
The third is waiting for them to get theirs before he commits to buy one.
I just checked and Buds Gun Shop has them in stock for $425.00
I'm chuckling here.
People who poo-poo'd my liking for identical rimfire/centerfire handguns,,,
Are now all jumping on the LCR-22/LCR-38 bandwagon.