Jono, I used the male-male adapter.
Yes I noted that the 10mm bolts are rather tight. I found that if I inspected the bolts carefully, dressed any small bruises and nicks on the shank, and kept everything clean and oiled, they did go in without hassle. Up to that point I was considering taking them to an engineering shop to get them reamed, but they ended up ok.
Consider that if the bolt fits perfectly with no residual clearance in the hole, the pitch of the holes in the bracket has to perfectly match the pitch of the holes in the caliper. With no clearance for the bolt to move in, the bolts can not move to accommodate any mismatch, so even if the bolts drop in the caliper hole, they still may not engage the bracket. Also if the bolt is not perfectly straight. In these cases you will have to get the holes reamed out.
From an engineering point of view, this is all a bit naff, and really they should supply the right bolts and brackets, or get the calipers bought in with a 10mm clearance hole instead of leaving problems for the customer to sort.
regards
Dave