Two things that I feel are worth taking into consideration when you finalize the barrel length:
1) 10-11" wouldn't be legal for hunting in BC.
2) My understanding is these are compatible with AR stocks, which means a lot of people will probably be switching out their factory stock, many of which will be collapsing and thus a bit more barrel could keep those configurations NR as well.
I'd be very interested in a shorter barrel that would work with a collapsing stock. I'm in the market for a new 22lr for my kids and the tm22 plus a collapsing stock is currently leading the pack for me.