How low is your humidity? If you willing water them morning/afternoon I think phals will adjust to your environment.
In my home humidity over winter was about 20% on average and i have vanda growing with no media and it managed to flower, but i did watered it in mornings and late afternoons. Summer it spent outside with also twicely watering. In winter i was just soaking it in bucket ,let it drain and hooked on its place amd in summer it was getting water from the hose. Yes, its inconvenient but doable.
I did mounted few phals recently. I think i put more moss than they usually put on mount. I spray them every morning till moss get wet but not soaking wet so water is dripping from it, if it hot day and moss dry by evening i also spray at the evening. So far they doing ok.
If its really pain for you water them daily than you can dismount them and pot in pots. To dismount You will have to soak them until roots will let you pull them from mount.