Why are there no kamas on the SWBF2 modeels when ported?
The simple answer to your topic question is, you don't.
The reason is because SWBF1 does not support a cloth system, and so kamas and such can't be added from SWBF2.
However those who really wanted kamas can add them by editing the unit model and adding the kama as part of the model itself.
Thanks