I update the information because of twitter conversation:
You can find the project here: lordofthejars/arquillian-multiple-war · GitHub
It works with Wildfly remote(and managed) and with Apache TomEE Remote (which in fact is equivalent to managed), but it doesn't work with Apache TomEE embedded. It seems a bug between Arquillian and Arquillian-TomEE integration as noted in this issue: https://t.co/pSCn9y9b3A
The profile that it crashes is called tomee-embedded.
Basically I need this feature to implement some kind of generic stubbing server extension for arquillian.