Hello,
I don't have PCOS but I would expect that you would have no problems following the extra easy plan on slimming world.
The only thing you may want to consider is the glycaemic index of food i.e. making sure you use basmati rice instead of plain white, granary bread instead of white/brown. Just google it to read about it.
However the principles of weight loss on extra easy should still be relevant and give you a good weight loss.
Give it a go and good luck x