I'll be honest, I don't think that this will necessarily answer the Gentleman's question.
The answer is, yes we can run 20V engines with the VEMS, but it will require you to immerse yourself in the workings of engines, and engine management systems.
If that's your thing then VEMS offers a great DIY system. But if you want plug and play then you will be better to pay more and buy a commercial system, or get a VEMS installer off here to do the installation and tuning.
Hope that helps
Rob