May not be what you're looking for but I've got a central gmail account that I have all my other accounts linked to (a few ways to do this) and then all the separate send as addresses to send or reply with. If I receive mail from one domain the default send as will that that of the domain it was sent to. Pretty straight forward stuff.
Then when I moved to android it was as simple as downloading the Gmail app and logging in with my gmail credentials and all the settings came across to my device.. No further setup was needed as it acts the same as the webmail and I can choose the send as address if I want to.