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Would it be possible to get a Garmin mount built into it
Anything is possible, Hippy wanted accommodation for a QuadLock, any savings from bulk buying would be contingent on you both wanting the same thing. My tarty Ventus bridge accommodates a a Garmin mount where there isn't room to twist the Garmin between the bars, but a simpler and much cheaper solution would work if there's space to do the twist rather than having a rotating mount.
If you don't want to change the mounting width of the pads, a very simple bridge should fix it. Not sure whether hippy has gone any further with the idea, if he hasn't you could both save a few quid by getting two made at the same time.