What is the best way to support multiple Vmm versions 2012R2 (including GA- to Rollup 11) and 2016

I have an application (c#) which works with Scvmm (queries, changes and etc.) One of the requirements is that it should work with multiple Vmm versions (not simultaneously). So I built a logic that identifies the correct version and loads the necessary dlls. But going forward, it becomes harder to support it. I would appreciate your recommendations regarding my issue. Also, I have to notice that if there was an official SDK - it would be excellent.