So 10.15 is called Catalina. 1st feedback on early installation attempts won't be long...
Lilu updated for 10.15 in v1.3.7 so no need to add boot flag -lilubetaall for 10.15:
Clover r4937 updated to support kexts injection in 10.15:
Catalina kernel patch to support kexts injection:
All thanks to contributors of Catalina test thread at IM.