Trying to modify the oal of a .22 LR round wouldn't be worth the trouble, I think. Since a .22 utilizes a heeled bullet, attempting to seat it deeper is not just dangerous, it's impossible.
Seems to me that years ago there was a jig or a die that would allow for trimming of a LR round to L length, but I'm fairly certain that if they even existed, they're long gone now due to product liability laws.
Thanks for the info re: 30 grain loads. I had not thought about using those, but may have to give it a try once availability returns to normal levels. I'd like to have something with a bit more punch than the CB loads for the occasional squirrel or rabbit.