Yes, several other teams or even individual users do support other models / brand boxes. Many, if not all use openpli as base image and make some changes to let them work.
There is a good reason openpli team doesnt support those boxes: most of the time the changes to support them needs very ugly patches.
Openpli expects manufacturers to deliver clean code so their devices work without any ugly patchwork involved, those patches tend to grow over time and eventually lead to instable code for all supported devices.
@Camping: ZGemma H.2S, Technisat Multytenne 4-in-1 @Home: Edision Mini 4K, Wave Frontier T55, EMP Centauri EMP DiSEqC 8/1 switch, 4x Inverto Ultra Black single LNB