Hope this works out ok, I've certainly had Vanda's with less than 5 roots but I would have done it slightly different.
What I see is one stump that has no growth to support so won't need much watering. The top half has little roots and lots of growth to support so will need a lot of watering.
You ask about the shade and that is a good idea - for the top half - but not the bottom half which needs to be encouraged to grow so wants plenty of light. Another reason to keep them seperate. That way you can water them seperately and maybe wrap some moss around the one with few roots to keep them hydrated a bit more.
It doesn't save on space but this in my opinion will cause a problem for one of the two orchids long term. One will want lots of water, the other won't and they share the same pot so that is not a good combination initially.
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