Your Acer will probably stand a much better chance in the ground than it will in a pot that keeps drying out or gets water logged.
To be honest though, Acers arent' the best choice for a very hot sunny garden like yours.
Just a couple of tips that might improve your garden and make life easier.
It really isn't that much work to make a tree thrive in a rubble filled/new build garden.
Choose a good tree for your garden. Go to an independent garden centre (not like B&Q) and describe your garden and ask them to recommend a suitable tree.
A crab apple would be lovely. Likes the sun. Beautiful blossom in spring (for pollinators) and then crab apples to look at (and for the birds) all winter.
Buy a tree in a pot and a bag of compost.
Go home. Dig a hole two or three times the size of the pot. Pull out any big stones you come across. Then mix together the soil you have dug up with some of the compost you've bought.
Plant the tree in the hole so the top of the pot soil is level with your garden.
Firm the whole thing in and water it. Like a whole watering can of water.
The planting bit of the above will take you no more than a couple of hours and YAY you have a tree.
Keep watering it and weed all around it for the first year.
It'll thrive, I promise.
You say you have plans to plant trees, well the old saying is that the best time to plant a tree was 20 years ago...meaning that then it will be big, established and you'll be very glad you did.
Honestly, just do it. Your future self will be very grateful.