depending on how the law is worded, it could be perfectly legal for those guns to be over 2J if they were meant for export.
in japan they have the 1J limitation as a law (before it's considered a firearm I think), but stores that have a special permit/license for exportation can legally modify a TM gun to shoot over that 1J limit for export customers only. The catch is that international customers have to provide the parts to do that, since I believe even the parts are hard to get in japan since there's no market for >1J guns.
HK though is a different story, so we'll have to wait for the details to emerge, and then trial before anything specific is known.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.