Different holding/maintenance/503 pages for different themes - Magento 2

Question

I have a multistore site (6 stores) that use 3 different themes, my question is:

How do I set a different maintenance/holding/503 page for different themes?

I can't find anything mentioning this so I'm starting to think you can only have one holding page across all stores/themes. My only idea so far is to try and check the themes inside 503.phtml and alter the markup depending on the theme.

Answer 1

The theme of the error page is stored to the pub/errors/design.xml:

<skin>default</skin>

There is no dynamic resolution of the correct theme for the error page. It seems like writing your own resolver is the only option.