In reply to pec:
Big thanks for the advice fellas. Defo going to rig a set of those bails up to test them out, hopefully next weekend if the cold weather holds.
Got the required tools and plenty persistence to get the new bails on, and even if it's a mare it's a welcome trade-off for a solid, bomber connection. I can say from past experience that the last thing you want to worry about when halfway up a dicey winter route is a crampon pinging loose! (thankfully I was seconding when it happened previously)
G20 crampons arrived today and generally they look the bizz but must admit I'm not sold on the 3no. central points below the middle of the foot.
Pec - regarding the 3mm gap, I've got the same thing with the plastic toe bail converters I put on my Petzl M10 crampons. I know what you mean, it doesn't look great or instil confidence but having done 4 routes last winter and 1 on Sunday I have to admit that they seem to be totally solid.