dalmif
you can build images with command like PROJECT=Allwinner ARCH=arm DEVICE=H3 UBOOT_SYSTEM=orangepi_pc make image,
where orangepi_pc is board taken from LibreELEC.tv/uboot_helper at allwinner · LibreELEC/LibreELEC.tv · GitHub
Actually, you can re-introduce OrangePi Lite support just by adding correct line in uboot_helper mentioned above.
Other than that, I would suggest you that you read build scripts. If you want to make anything useful, you have to understand them any way. At least I started that way. Build system also contains documentation which explains what various package variables mean.
BTW, there is NanoPi M1 variant with 1 GiB of RAM, so I could add it in next release if you wish. But until now nobody expressed any interest.