Question on HUD scaling with resolution changes

[Tashigi]

It's a good question.
In theory, you shouldn't have to do anything as the UI currently adjusts automatically to your current resolution.
I run the game at 2560x1440 but often drop it to 1080P and it automatically adjusts.

In practice, though I don't have any personal experience with what you plan on doing (Just yet); I foresee one major issue.
Your game/client will see your primary desktop/system as the primary display driver. Thus, if you stream that resolution at say, for example, 1440P to a 1080P device, it will simply stream the 1080P portion found in the center of your 1440P screen and it will not adjust your UI, either.

A solution to this issue would be to lower your PC resolution to match that of your portable device.
This should stream the proper resolution and adjust the UI at the same time.

Hopefully someone with actual practice in this matter responds to you.
I'll be trying this in a few weeks, though. So if you haven't gotten a response, I'll try to come back to your thread.