Hi Johnny ! Your new Phals and Oncidium looks nice. If you want to repot into SH I would cut off the spike right at the base, so that the plant can divert energy into making new roots and growing, rather than on the flowers.
As for the aerial roots, DO NOT force them into the pot, these roots have developed for aerial growth, they will die and rot in the constant humid wet environment of SH. New roots will grow into the SH medium that are adapted to this kind of environment. Simply leave the aerial roots where they are and keep misting them.
Oncidiums do very well in SH. You should keep the bulbs about half an inch above the level of the media. Only the roots should be in the medium.
Earlier it was though that for SH size of pot was not very important, that is true from the perspective of water and humidity, but not so much from that of air movement. I would not put them in very big pots. If they are currently in 6 '' pots, put them in a 7 or 8'' pot. Make sure that none of the old roots are immersed in the reservoir at the bottom, for the same reason that I mentioned for the aerial roots, soon you will have new roots that will grow into it.