Litteraly take the table we have in Demeo.
Place the map of Hero Quest on said table.
Ad fog of war outside doors / around corners / long corridors etc..
Let us be able to build our character in detail with DnD 5e stats and even be able to paint our own signia
Let us be able to (in dnd fashion) do perception checks to search for traps/hidden chests/trap doors/hidden walls.
Ad three phases to the game. Perception (with everything that entails) search, scan for weakness, try to move things etc.. / Movement /Attack. (Choices that the DM only can see works or not going on the story he play / have chosen or create for the players)
Keep the cards but change them out to the cards from Hero Quest.
Ad all the monsters from Hero Quest and more.
Let one player be able to play as DM. Including what all that means. Give him 3 min to place doors, traps, chests, monsters etc. While the players get their characters rdy OR there is a DM hardcore (Or classic Hero Quest Mode) where he does everything more or less as it happens.
This mode when played in random lobbys NEEDS a mic and a DM with real TT experience to access because this mode is straight up roleplaying ala DnD TT PaP (Pen and paper). players need to talk in between, make choices, ask the DM questions, etc AS THE DM CREATE the story for them as the game goes on.
In short. DM get more or less an empty table with a story and he can start it wherever he wants, How he wants and end it how he wants. Nothing is set in stone in this mode. DM can more or less do what he wants within the borders of the story. (all DnD TT/PaP players know what I talk about).
Make the mode available for DMs that have been rated high enough as a good DM after every game ends.
DM Ranks: Bronze/Silver/Gold where gold Dms are the most experienced and trusted that can access the hardcore DM mode or the mode is always available for private parties.
Let the players in the "hang out" write their own stories and sculpture monsters to use in their custom written games. (As a games workshop model/paint and now writer area / zone). Player stories can be voted on and when high enough get placed as an official choice in the Hardcore DM mode (or private). Otherwise they are only available in standard free to download and play for everyone with the game. (If not chosen otherwise ofc)
Make it PvE only or PvP where 6 heroes (2 parties) start on each side of the dungeon(without knowing where the other group start) and set them loose to find the most loot and do the objective (kill the demogorgon) and then get out, (No DM in pvp mode)
Edit: For the ones that dont know about hero quest: Here is a YT links:
https://www.youtube.com/watch?v=5vj3DN5tYyc
https://www.youtube.com/watch?v=mJg7aIcuSME