Thanks all.
Success, so far as I can tell. All very civilized.
Didn't use thread lock on those 12 points though. Now I'm worried about that.
Decided I don't need those screws (can't see them doing anything).
Finding a 12 Pt 13mm proved to be the biggest challenge for no good reason.
Not 100% I got the bleed right — what kind of symptom would I get if there was air in there? I mean I think I got it, but still…

Only one regret — not ordering some spare "caliper guide pins". I had a rotor/pad kit from rock auto that included 6 bolts that I have no idea what for as they didn't match anything I removed but no pins. The old ones could have been better, but cleaned up were serviceable.

Otherwise pleased. Should have done that a long time ago!