Would this work with the C1001?

[Flavor-name]

I see your working with 24ghz radar chips. Have you taken a look at this one.

C1001 60GHz mmWave Indoor Fall Detection Sensor for Arduino / ESP32 / micro:bit (11 Meters)
https://www.dfrobot.com/product-2861.html

Can detect human presence, like in bathroom stalls, is someone there. No movement is required.
Can detect breathing, sleep state (from breathing pattern, probably).

Will this DFRobot 60ghz module function in the way your project intends with the Seeed 24ghz board?

With a wave guide, generate propulsion when the focused beam interacts with an electrostatic field, Yeah!
But that would involve building a Tesla Coil to have an electrostatic field to play with.
Then Interferometry..., Yeah!

Are you familiar with the work of John Kraft?
Build Your Own Drone Tracking Radar
https://www.youtube.com/watch?v=igrN_wd_g74&list=PLxC4LYGYcMqmPDEr8E8AlktQPcuHx4izm