Paver Patio with Backfill Settlement Around Block Foundation
This can be a tough one to answer, I don’t like to pour next to block walls after seeing pours crack the walls.
always settling is kind of true as you add it compacts more but you want some voids in the gravel for water to flow.
For me I would rather have to flip some pavers than take a chance of the angled pad cracking your wall as it settles.
I used to think all block walls leaked but realized it was mostly old block walls that had dirt and not rock back fill. I would recommend plastic sheeting at an angle like you planned with the concrete to slope away for drainage and to contain your sand.
Then in 4-5 years add sand as it settles.
The pavers will also help to deflect water away from the wall but buy not having a solid mass of concrete there will be less lateral force on the wall and this may be your best option but you will probably need to add sand.