I did it the same way as @Batt- the only issue I found is that the hanger insert moves the mech about 5mm outboard so it takes some extra fiddling to index for the granny gear.
Also it's a complete pain in the arse to change a tube. Unlike Batt's I use SKS front mudguard stays for the rear guard, so they can pop out without having to undo the bolts.
Yes, when I used to commute with mudguards on this bike it was a total arseache.
I'm leaning towards the most simple solution (or one of), which is to weld on a hanger like this if I can find one. Different dropout but you get the idea:
I did it the same way as @Batt- the only issue I found is that the hanger insert moves the mech about 5mm outboard so it takes some extra fiddling to index for the granny gear.
Also it's a complete pain in the arse to change a tube. Unlike Batt's I use SKS front mudguard stays for the rear guard, so they can pop out without having to undo the bolts.