There is an interesting new sensor model on the market - Panasonic SN-GCJA5
Technical information:
https://na.industrial.panasonic.com/products/sensors/air-quality-gas-flow-sensors/lineup/laser-type-pm-sensor/series/123557/model/123559
https://www.mouser.de/new/panasonic/panasonic-sn-gcja5-laser-pm-sensors/
Much smaller than the SDS011 - a quarter of the size.
About the the same price as SDS011.
Maybe it would be worthwhile to implement this sensor?