Rosemary wood for mounts + tips on keeping mounted orchids in a home

[Leo H.]

Hello,

First of all: Happy Easter to all of you who celebrate

This year brought unusually harsh freezes and sadly, our big old rosemary bush did not make it. It was cut down a few days ago and I reserved the trunk section because it looked so nice and has a great texture. Can anybody confirm that it is orchid-safe?
I would like to mount different small to medium-sized warm to temperate growing Angraeciinae. This brings me to my next problem: I want to keep them in (?) my southwestern exposure window where they get blasted with (filtered) sun from March to October. It has very specific humidity and temperature conditions that I tracked with a Sensorpush since 2018. They are the following:

March-May
Night: 45% Humidity, 17-20 degrees C
Day: 30% Humidity, 23-30 degrees C

June (when there are a lot of thunderstorms)
Night: 60% Humidity, 21-22 degrees C
Day: 50% Humidity, 26-30 degrees C

July to August:
Night: 65-70% Humidity, 21-25 degrees C (it is uncommon to have AC units in Germany)
Day: 40 % Humidity, 26-32 degrees C

September to November:
Night: 70% Humidity, 16-17 degrees C
Day: 45-50% Humidity, 21-23 degrees C

December to February:
Night: 55% Humidity, 15-16 degrees C
Day: 45% Humidity, 21-23 degrees C

As you can see, especially spring does not favour growing mounted orchids, while months like October or even June are more fovourable. I can confirm that. Right now, it is very hard to keep everything well-watered, even though I use rather big amounts of Sphagnum moss on my mounts. But with Angraeciinae, as far as I can tell, Sphagnum is not recommended around tge base. So, I am asking you which species are the most drought-tolerant ones. I would like to mount plants with greenish-white or white flowers that are maybe fragrant that like my temperature regime. I heard there are a lot of plants fitting those terms in the alliance .
And as a sidenote, I bought a Levoit humidifier, so all the values of humidity given should be above 50 when it arrives .

Kind regards,
Leo