Can't see how a phased return will work. Say they allow 5k into our place for a game. Starter , no away fans. Then, how do you get people into the stadium then into their seats? Cancel the first 5 seats of each row sum people can walk up/down the aisle. 3/4 rows apart then 6 seats on each row apart.
You'll have to go in the ground in some kind of order as you can't be walking pass somebody on the same row to get to your seat. What if you need to go to the loo during the game? Whoever is on your row will have to get up & down/up the aisle before you can go to respect social distancing.
The same applies at FT. You will have to do a phased exit, each row at a time from the back to the front.
Unless I'm overlooking something here, you'll only get 2 persons, per row on about 5 rows in each block.