AFe has come out with a HAS option with promising specs.
Excerpt below is from AFe's product page. Note the spring rates which put these between the OEM CP and Swift Spec-R’s.
https://afepower.com/afe-control-var...height-springs
aFe Control would like to introduce the Variable Height Springs (VHS) for the 2014-2016 BMW M2/M3/M4 (F80/82/83/87) chassis.
The VHS system was developed for enthusiasts who desire the ride height adjustability of a coil over while still retaining their OEM adaptive factory shock absorbers. The system features slip on coil over sleeves for the front struts that are TIG welded, and zinc plated for maximum durability.
Installation is simple, just press off the factory spring seat and replace with the aFe Control VHS. The system includes mounts for the OEM accelerometers and sway bar. M specific front springs are included and feature a progressive
224 lb/in" rate while offering 0.5 “ to 1.5 “ of lowering.
In the rear, CNC machined 6061-T6 aluminum ride height adjusters also offer 0.5 “ to 1.5 “ of lowering and maintain the factory spring location for quiet operation and strength. The
700 lb/in" rear springs were developed specifically for this application to maintain proper balance with the adaptive ride shocks.
Elevate your driving experience with the comfort, precision and excitement of the aFe Control Variable Height Springs (VHS).
Also Fits: BMW M2/M3/M4 F80/82/83-87 14-16 non adaptive ride