I don’t know of any wireless 345 mhz curtain motion detectors, but you could use a wired one along with a DW10 as its transmitter.
Something like the Honeywell IS216T-CUR would work for you. It would need a 12VDC power supply, then wire its Normally Closed output to the wired input of the DW10. You then program the DW10 into your panel as a sensor type (04) Interior Follower on a 2GIG GC2.
The video below shows a similar process of using a wired shock sensor with the DW10 input. You would do the same just with the Curtain detector output.