I might:
- Mark where the bracket is going.
- With a 25mmm Starrett drill the pb and mark the block behind with the pilot of the Starrett.
- Drill the wall for resin studs.
- Puff out the holes.
- Inject resin, push in studs.
- Put a nut on each stud then a penny washer level with the face of the pb.
- Bolt bracket on
Only issue I can see is whether the M10 nuts & protruding studs holding the bracket on would affect the bit of the bracket attached to the tv. Also would want to get the studs all the same length.