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You are correct that the multihome facility exists only in Remoting versions 2.4.x/2.5.x. It was a substantial code change, and it won't be ported back to the 2.2.x versions for AS 4. In fact, all of these versions are now in maintenance mode.
The only thing I can suggest (other than doing the port yourself) would be to drop in a 2.5 version (2.5.4.SP4 is the latest) and see if it works. I expect it to be compatible, but there are no guarantees.