Creation Rule - Additional Email (Make another address Primary)

We started testing using creation rules to try and pair our user creation templates down form 30+ by adding a condition based on Office.

However the problem we're having is the email part.

We own 6 other companies that have their own unique email addresses and those need to be the reply to addresses (not our main company address which everyone gets).

With the Creation rules it seems that it won't let " Automatically update e-mail addresses based on recipient policy" be unchecked unless we specify a SMTP address (primary) vs an smtp (alias).

So for example -

employee A works at Site Chicago and for Company Apple with primary email address bob@apple.com

employee B works at site NYC for IBM with primary address sue@ibm.com

both employees have our main company email as an alias (bob@usa.com and sue@usa.com)

we tried to have if Office = Chicago set Additional E-mail addresses to:

SMTP:%givenName%[L].%sn%[L]@apple.com, smtp:%sAMAccountName%@%domainDNSName%

The template however needs SMTP:%sAMAccountName%@%domainDNSName% or it doesnt let us save the template and when tested only generates the @usa.com as primary (no aliases).

Anyone have any experience using the Creation Rules and assigning a Primary email other than the domain email? [hopefully this made sense, lol].