LiX's Nanopi-R5C CSC stuff is in the Armbian build tree, but no automated community images are being published currently.
Unofficial unsupported R5C builds here:
https://refuge.armsurvivors.icu/lanefu/lanefu_24.2.0-trunk_Nanopi-r5c_bookworm_current_6.6.13/
https://refuge.armsurvivors.icu/lanefu/lanefu_24.2.0-trunk_Nanopi-r5c_sid_edge_6.7.1/