ORIGINAL: Miller
I think most (if not all) 15 knot xAKs (Yunsen class) can be converted into proper AKs starting 6/42. They have the range to travel far as well.
For the benefit of those just starting up on this side some Yusens can be converted to navalized vessels in the first month.
xAK Yusen -A 18 knots there's an option to convert to navalized AKs in 12/41 ( my count is 7).
xAK Yusen-N 15 knots Although my math gets fuzzy as I get short on fingers and toes the option to convert 57 of them to navalized AKs as of 12/41 starting in 6/42.