Let us know how your soil analysis turns out ... you chose well on the level of testing. Did you figure out how big the brick path is? I found one of those last year as I was expanding my garden. Well, it was really a ‘pad’ rather than a path, but it had been outside one of the doors to the cow barn that was there before I was born. The bricks were really large and quite nice ... I’ve got them stacked and hope to do something with them in years to come.
It turned out to be more like a pad also, 3’x 5’. It is out in the middle of the Back yard and about 15’ away from a covered patio. It could have been used for just about anything. A base for a bird bath, planter or a BBQ pit, etc.
I will be glad to pass on the info from my soil test and what the Extension Agent recommends.