Well, from what I read there, I would assume the following would work:
when 1 then
@WTSweapon_experience = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
@WTSweapon_levels = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2]
EDIT::
Nevermind, after looking at the topic I don't think that's correct. The first thing you need to do is go to this line:
$WTSelements = [17, 18, 19, 20]
Change it to add 22 as an element, so:
$WTSelements = [17, 18, 19, 20, 22]
Then, to start it at level 2, all you'd need to do is:
when 1 then
@WTSweapon_experience = [0,0,0,0,30]
@WTSweapon_levels = [0,0,0,0,2]
The 30 comes from this line:
$WTSexp_levels = [10, 30, 60, 100, 150, 210, 280]
since NAM says to try to get exp to match to level.