Now what? please advise on next moves.

I would say just keep an eye on mum, if she gets distressed then they need to go out with the others. I would say that it is a little too early yet and to keep them seperate but with mum in plain view of the other birds. Mum will protect them as best as she can. We let ours out at about 4 weeks old for an hour or two at a time will we were with them to make sure they were ok for about a week, after that we took the plunge and let them get on with it but making sure they had somewhere to hide if they got picked on.

Have no idea about the back toe thing tho!

I let my first broody and chicks out with the other hens after two weeks (after spending the first two weeks in view of the others) and the second broody and chicks when she wanted which in her case was a couple of days (mind you she is joint top chuck with her best mate) and mine all free range with plenty of places for them to go. Had no problems at all - although I did keep an eye out morning and tea time though as we are on a crow flight path at those times. I dare say though that other people on here will say that is wrong but it worked for me  .
Can't help with the toe thing though sorry.

Thanks everyone.