writeable secondary zone?

[Nex6]

I have a very specific issue, where a partner org, wants me to add an
SRV record for there org. (i dont want to)

- NOTE: and its for a major cloud app (to remain nameless) that points
back to there active directoy.


but this is a requirement for a cloud application. the only solution I
can think of so far, is build out a new DNS box for just the users
that need to use this application.

and add the SRV record there. but, not sure how you could setup a
secondary zone, thats writeable?

any thoughts on this?

-Nex6