Hi Genedaniels,
As long as you have good clippers, it will work out .
Such trenches are used to have trees to be moved to a final place later on or to be traded.
You can leave them there especially if you train one to the left and the second to the right.
If you try to push them both to the center, one will overgrow the second, and the weakest won't be productive and will struggle for life...
If you plan to move them later on, wait until October to lower the transplant shock and have better root ball.
In an 80 liters trashcan, I have one unknown and two young Dalmatie. They don't shade each other, so for now they are all fine.
I just fertilize and water a bit more as three trees are eating at that dirt ... In fact they are four in a cross shape, but the sister from the unknown isn't showing any sign of live ... But it still isn't late for .