Custom POI Proximity Alarms on Montana 710

I have used POI Loader to install over 200 Custom POIs onto my device.  The POI Loader software gives the option to set a proximity for all Custom POIs, but doesn't seem to load these as Proximity Alarms to the device.

I want to set the same Proximity Alarm for all 200+ Custom POIs.  Is there a way of doing this in bulk - ie select multiple POIs (or other waypoints) and set the same Proximity Alarm for them all?  I can set them one at a time, but that's going to be pretty tedious for over 200 points, so am looking for a way to apply the same alarm to multiple waypoints/POIs.