This is an interesting question.
(1) I previously inquired about this and was informed that rechargeable devices are humidity-resistant (IP68) and do not require a dehumidifier. HAs with replaceable batteries don’t have the same level of sealing.
(2) I have a Phonak dehumidifier, I have used it with my Phonaks: No issues.
(3) My Phonak dehumidifier’s operating temperature (35C) is close to the average high temperature you may find in Taipei.
I remember Taipei well – it’s so hot and humid there.