Mounting An Axis A8105-E Over A Single Gang Box?

We have a retrofit installation where an Axis A8105-E will be placed over an existing, recessed single-gang box where there was previously a wall phone. The A8105-E form factor was clearly meant to be able to fit on a mullion and there is also a recessed mounting bracket available but.. nothing factory that I see that will make a "clean" install over top of a single-gang box which is kind of surprising given how common ( I would have thought) that would be. The best I can come up with thus far is mounting on top of a blank plate on the single-gang box which doesn't do the aesthetics justice so to speak. Anyone done anything else with these?

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