I would probably bow out gracefully. Then in a month or two ask the two ladies who have helped you over to see a project you are working on and desperately need their advice. Keep it on task and whatever you do, do not complain about the group. You might express to them that you so appreciate their help and miss their company. Serve them some tea (or other appropriate beverage) and thank them so much for their help. Let it go for a while and then have another problem you need their help with, after a couple times, then suggest you meet to work occasionally. If all this is kept positive, you might work into a group who will really want to sew, not complain. Good luck with this.