I drill (and countersink if you like) a hole at each end of the ledger plate and present it to the wall in exactly the right position, this is the awkward bit as you’ll need another pair of hands and some things to prop it up there with. Drill through these holes and in to the wall with your 500mm SDS bit.
Tape a smaller diameter piece of tube to a vacuum cleaner and clean them out. You can then squirt your poly resin through the timber and into the hole, you’ll use half a tube for each one. Slide in your threaded rod flush with the joist or you can cut any excess off later if necessary. Leave it to set. Place your washer on and hand tighten both. You can now drill the rest and repeat the process. Try to aim for the center of stones if you can see them.
The drill bit doesn’t run off due to the ledger plate keeping it aligned. You can use smaller diameter rod and a smaller bit I suppose but bear in mind that the entire weight of the joists, floor covering and whatever else will be above is going to rest on those rods.
You could sit the joists directly on the plates if you have the height to do that but then you’ll need to devise a plan to hold them in place, obviously the would just rest there but you could end up with a creaky floor if the move at all. This is why I use all of the nail holes in the hangers. Also you will need to hide the ledger plate in the plasterboard and dues to its thickness you’ll lose some space in the room. (I can expand on the if it’s not clear!)
I use the following table to determine joist dimensions. 100 x 100 is too small IMO.
Best of luck!
If you regularly do DIY, I highly recommend getting a copy of the book that table cam from, it’s invaluable.