Hi All,
I'm trying to mount a tv to a wall that's made from aerated concrete blocks, and I'm facing a slew of issues. So the concerns are:

• The plugs will pull out (see this video),
• The use of resin filler is a no go (previous owner had it, took an angler grinder and new plaster/stucco to fix it),
• The foot print of the mount is too small,
• The weight of the tv will pull the wall down

Hard facts:

• Aerated concrete wall: 8cm thick
• TV weight: 35kg
• Mount arm length: 45cm
• Mount wall size: W=6.5cm H=25cm

I'm not planning on having the tv at full arm extension, but the GF is worried about the worst case scenario of someone pulling it out and the stress will cause the wall to break and come down. Or even the mount coming lose and wrecking the TV.
So It seems like the best case scenario is to drill through the wall and put a back plate in, sandwiching the wall between the plate for the wall mount and the back plate with metal bolts holding it in place.

So I guess I'm looking for advice on:

1. If this idea is crazy?
2. How thick should the back plate be? Is a 1cm wooden block enough?
3. Do I need a front plate to increase the surface area from the wall mount?
4. If I do need a plate how thick should it be to not just bend? is 2mm aluminum thick enough?

I've spent a day trying to research and worrying about all the parts. Any experience you guys have would be awesome as I've not worked with these blocks before.