Sorry, I don't know how to test it. EAG V2-V11 already have a very large internal opening book, you can enable more variations with OPT1 F1.

The PCBs do have the 18-pin edge connector for modules. And the V2-V10 manual(Fidelity_Elite_Avant_Garde_Custom_DE.pdf) briefly mentions the module slot at section 6.4.