KernelSu Rooting for Raspberry Pi

I already have LineageOS 20 from KonstaKANG running smoothly on my Raspberry Pi 4 and Magisk is giving me temporary root access, but I now want a cleaner, kernel-level solution. The goal is to rebuild or patch the existing LineageOS kernel so it works with KernelSu Next and drop Magisk completely... (Budget: $250 - $750 USD, Jobs: Android, Android SDK, Android Studio, C Programming, Embedded Systems, Linux, Open Source, Raspberry Pi, Software Development)