Looks like I found a way to use lx200 onstep driver as a focuser by creating a custom driver and reassigning the type. But have to solve other things.
1. The rotator can be found but cannot be assigned to my optical train.
2. The Wheather tab doesn't show any info (I use bme280).
3. Focuser works weirdly. It moves the motor only when pressing the up arrow button for the first time (the next press of the button does nothing). Pushing the down arrow button occurs an error every time (doesn't depend on focuser position).
All these things work in windows via ascom driver, so the device is working properly.

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