SH below, air roots above. How to repot?

[Kim in CT]

I have several phals that were potted up in semi-hydro and, over the past few years, have put out rather large aerial root systems. What's the best strategy for repotting, when the time comes? There are roots in the LECA but probably more roots in the air. Is the plant telling me that it doesn't like my SH environment and would prefer a switch to bark? One of them is a bellina and I want to be sure I repot her in the best way.

I'm a window-sill grower in zone 6 and our humidity is about to drop significantly for the season (from 60% to 20%). I'm nervous about whether those air roots are going to survive.

Advice? Thanks, Kim