Hmm .. even though (after all this time) I still don't have a definite Best Answer I feel like I have to update this thread.
I have asked for assistance on the MControlCenter GitHub page and I've been ignored, kind of. Irrelevant though, because some time ago, after one of the weekly Solus updates I decided to restart the app and see if it runs properly and it kind of did, most modules loaded. Mode (Power Profiles) are still grayed out but Info, Battery, Fan Control and some Settings work.
Solus team, whatever you did, you did good!
Thank you! : )