Hello @Chris_Harris2,
see point 8 in this post: Project templates V2: what we gain, what we lose
With Asana project templates v2 that does not seem to be possible yet.
And here is the relevant feedback request thread:
So if you want to use the v2 template feature then I don‘t think there is a way around it at the moment.
Keeping specific projects just named as templates would allow for this but is not recommended because then you lose all the template features which defeats the purpose.
However what you could also do is working with rules so as soon as a project is created from a template they trigger the multi-homing.