To add to what NatePlays has said.
I actually contacted Restart - the author of the Fossil plugin - myself personally, about the possibility of porting the SRPG Engine MV, to MZ. Initially my intention was just to make sure SRPG_core.js could run on MZ.
But Restart was too generous that he instead tried to port all the extension plugins that were in my last demo. So far SRPG Engine MV is running on MZ with a few bugs that might interfere with your experience:
1. Some UIs don't appear as they should;
2. Dynamic Actions do not work;
3. Some plugins or features may not function as they should
After several patches, I told Restart to temporarily suspend the SRPG Engine MV patch into Fossil. I ask that because before porting to MZ I want to make sure that the SRPG Engine MV is first updated to a future demo. In the new Demo there will be some changes that are expected to simplify the SRPG Engine making it a bit easier for new users, as well as the addition of a few plugins to the Demo. This avoids the hassles that Restart might experience if we keep making changes to the SRPG Engine MV.
In conclusion, if you want to try SRPG Engine MV on MZ, you can already do it with Fossil. But if you want to wait for a more stable version, please wait until we release the latest, more stable Demo.