The cold water coming in might branch off and head to the tub laundry and outdoor faucet... Then continue on to the hot water .... then hot water gets sent back the bath, laundry and kitchen ...hot water only.
Even if you had to re-plumb to your bath and kitchen with all new supply lines to each fixture by cutting through the top wall plate some drywall it would still make more sense than tearing out concrete trenches all over your house.
Think up and over. Not down and through.
New supply could travel through the attic crawl space and branch off (cold) to bath, kitchen, and faucet plus laundry etc. Then off to the hot water heater to supply back to fixtures. I'm assuming no water softener or otherwise everything but outdoor faucet gets treated first.
Holes could be drilled in to top plates of walls from attic/crawl. Copper or, better yet, Pex tubing could be shoved down to fixtures.
If you are REALLY fortunate, you have access through drywall behind at least some of the fixtures or hopefully at least the tub faucet.
You might look for someone who advertises "re piping" - we have them here in Chicago. People like that might tend to be more creative and efficient.
You might get lucky and be able to cut and connect to the bathroom Supply entrance point and keep most of the old copper behind the walls.
Of course I could be talking out my arse because I don't know your layout. Or if you can even use Pex in your town. Or what acces you have in the attic or your climate etc etc.
I'm assuming attic crawl because you are on a slab. Hopefully warm climate or ability to insulate pipes in attic
I haven't watched this whole series but this is an similar to what I'm talking about:
https://m.
= new reply since forum marked as read