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What should be done w/ a Norfolk Island Pine that set outdoors in the sun at 80* temp and now a little light on ends of limbs like sunburnt a little. Not at all bad but I can tell a diff.

No, you should not separate the plants.

They are fairly easy to care for, but once the leaves begin to yellow, the lower branches will eventually die and drop off.
Insufficient moisture in the air causes the needles of the Norfolk Pine to turn yellow and then brown before eventually falling off. Mist your pine with cool water daily to raise the humidity level.
The plant should be watered frequently during the summer months to keep the soil slightly damp. Be careful to not over-water, as this may also cause the leaves to turn yellow.
They prefer an eastern or western exposure with one to two hours of sunshine daily. Place your plant near a window for best results. They can also survive in household light if they receive at least 16 hours of light a day. Turn the plant frequently to keep it symmetrical.

I know Norfolk Island Pines can develop multiple trunks, but these would usually emerge from the ground. Aboveground trunks usually grow without branching. But since your trees' forks emerge from so high up in the tree, it seems unlikely that they would have developed because of pruning. Is it possible that wind damage caused this? Norfolk Pines are (as you already know) very susceptible to wind damage. Perhaps a few years ago wind caused a break in the main trunk high up in the tree, and this led to the fork?

Cincinnati does have a botanical garden located at the zoo, and the Krohn Conservatory in Eden Park. Perhaps they would want to adopt your tree or would know of someone who would.

Pruning is not recommended for Norfolk Pines because it permanently stops the tree's growth at the cut point, and the tree usually ends up looking (permanently) lopsided or awkwardly shaped. This is an option if you are desperate, though, since it shouldn't kill the tree, and would allow it to fit in your space.

Depending on the size hole, It will not harm the tree. Now if you are taking out half of the root system, then yes I would expect it to be damaged. If it is just cutting through a few roots, the tree will be just fine.