Connecting the multiverse (Character sheets)

Good Morning,     I have been trying to figure out if there is a way to bring 2 systems together in Roll20.  The simplest example I can make is say I own the Roll20 module for Curse of Strahd (or any other module).  But I want to play with Daggerheart rules and characters.  I only want the art assets and maps of CoS, but I want the rules and character sheets for my players of DH.     Now, obviously none of the monster tokens in CoS are going to "magically" be polymorphed into DH advisories. I will have to open the tokens are create/update those myself. (I know that currently Roll20 does NOT have advisories yet, but hopefully they will someday) So it will take me as the DM some time to go through all of the monster tokens and update them, and rebalance how many and where they are, but that is a job I'd be willing to do in this type of scenario.     Is there already a way to do this in Roll20?  If so I haven't found it yet.  Is this type of feature/functionality on a future Roadmap for Roll20?  Would this bring about the collapse of fabric of reality in both universes and bring about the heat death of all things? Thank you :)

For what you specifically want, just make the game with the Curse of Strahd module. Then go into the game settings page of the game and change the character sheet. The stats of the monsters will of course not carry over, as you mentioned, but the maps, tokens, handouts, and everything else will still be in the game. You'll also have the Daggerheart Demiplane Nexus (assuming it's been hooked up for Demiplane/R20 crossplay yet).

Thank you very much for the suggestion.  This worked, it took a bit.   While you can not create a game with CoS, and then change it's character sheets to DH.  It gives you an error message when you do that.  But the error then says to make a "copy" of the game.  It took me a while to find where the copy option was, but the "copy" that I made of CoS was made with DH character sheets.   So yes, I can run one game systems module, with another game systems rule set.  It just takes a few hoops to jump though to do it... Fewer than the number of hoops I'll have to jump though to change the Monsters in to Advisories heheh. Now I just would have to wait for Roll20 to make Advisories a supported system in their VTT and I'll have something I can work with.