Allow another tenant desktop access on AzureAD joined workstation

[Swamination]

Is it in Microsoft's design to allow two tenants to federate in AzureAD so that both tenants could authenticate into an AzureAD-joined desktop?

Example: Say CorpA would like CorpB to be able to log into their AzureAD-joined desktops. Could a federation, access policy, or some other method be created to allow CorpB to do this?

[#2]

This isn't currently possible. 

[#3]

Somewhere late last year I had tweeted this directly to Alex Simons and Dona Sarkar both. We are looking exactly at what you are looking for.

I had received a reply that it was on backlog from Alex. There was no technical design to achieve it. I hope we have this soon atleast on MMD (Microsoft Managed Desktop).