"a few points" != "earlier"
at 161 you need 4 or more points.
A few = 2 or 3
So, can you do it at 160 or can you not?
for clans it'll be 1 level higher.
Imo there's zero reason to do at 160 when at 161 you get persisting rarm/Larm/thigh/chest/Rhand iirc.
I have a 161 soldier who I'm trying to get a sinew for and I'm hoping I can do ofab on it as well.