O365 Hybrid/Multi-tenancy.. Can it be done?

Hi forums,

So to give you a quick background, I work for an organisation where we do work with federal government organisations and compliancy is key. We are currently sitting on SharePoint 2013 on-premise, however we plan on upgrading to O365 soon.

To be compliant, a specific area of our business must either be on-premise OR go into a Government version of O365.

So the advice I seek...

1. Is it possible to have 2 O365 tenants. So we could have the standard Commercial tenant for the majority of our business, then a second Government tenant which can be used by the smaller part of the business which must meet specific compliance.

2. I know hybrid environments are possible O365 and On-prem, however if two O365's are possible, which would work best/require less over head?

Thanks

M