What about the X4s? It has a mechanical shutter. Funny thing is though that the sensor and specs are almost identical to the P4P.
I’ve looked at the P4RTK myself and just can’t wrap my head around why I would spend that much money for a closed system GPS. I know the setup that I am using is not totally professional-looking, but it also works with other survey gear and costs a quarter of what the RTK does.
https://forum.dronedeploy.com/t/phantom-4-emlid-rtk-ppk/11686