Maybe a bit OT as you say, but I think I have an answer for you Kjeld.
The program you want is called JT-Alerts. It will interact with DXLabs Spot Collector to do what you want.
It will also interact with many different logging programs, checking if a state/dx/grid is needed. Then, if you wish, it will activate audio alerts when the 'wanted' station sends a cq or even if it is decoded as sending info in another QSO.
The software can be found here:
http://www.ham-apps.com/
I agree JT65 is an amazing low power mode for dxing.
From West Texas, on 20m this week, I managed ZS2EC -22db/-22db and YB8EXL -17db/-18db
Running 20w from my K3 into a 7' tall Hi-Q 6/160 screwdriver vertical antenna,
with 16 radials each 13' long at 20' above ground on the 2nd floor roof of my apartment building.
(-24db is the weakest signal I have ever seen decode with the JT65-hf software)
73 & GB
K5OAI
Sam