Proximity Alert/Alarms for paired devices

Hey All.

Looking for something a little different. I usually carry two phones (One for Work, one personal). I'm hoping to set something so that in the event I forget one or the other, the phones will Buzz/Scream/Make Unpleasant sounds until brought back in close proximity.
I know I can do something similar with those tag things, but that only works for the tag. I'm looking for Device to Device.

Has it been done? I couldn't find anything on here about it.
Can it be done?
I'd love to try and start it myself, but I'm new to coding.

Thanks in advance,

Faustus Caligula

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