the Moto C “namath” mediatek SoC is related to “perry” (Moto E4) and a build tree can be derived, but both have no maintainer and the last thread I could dig up are Linage 14.1 based (nougat). Without porting to a newer version you could create a nougat community build. If you find a public build tree you can ask for a community build or if you want to get into it, build yourself.