These are all the Mods that I use in the Map Editor. I am not sure if you need them all, but if I used things like Intersection Marking Tool, Node Controller Renewal, or Surface Painter;.. things that are required after you have used them, then I probably need them when converting the game into a map?

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• Subscribe to ModTools (BETA) mod from Steam.
  
• Copy the Workshop Folder
  (C:\Steam\steamapps\workshop\content\255710\2434651215)
  (and rename if desired) to your Users CS Addons Mods folder
  (C:\Users\ \AppData\Local\Colossal Order\Cities_Skylines\Addons\Mods).
  
• Then Un-Subscribe ModTools on the Steam Workshop.
  
• Enable your local copy of the mod in the game's Content Manager.
  
• Exit CS, and restart to Main Menu(PLAY).
  
• With ModTools enabled, hit F7 in the game’s **MAIN MENU** to open the debug console.
  
• Paste the following command in the ModTools Debug Window's textbox, and click RUN:
  (Special Thanks to SamSamTS, Ronyx69 & Boformer)
  
  SaveGameMetaData saveGameMetaData = SaveHelper.GetLatestSaveGame().Instantiate<SaveGameMetaData>(); LoadingManager.instance.LoadLevel(saveGameMetaData.assetRef, "MapEditor", "InMapEditor", new SimulationMetaData() { m_WorkshopPublishedFileId = ColossalFramework.PlatformServices.PublishedFileId.invalid, m_updateMode = SimulationManager.UpdateMode.LoadMap });
  Wait ....
  
• When it's finished, it will show your new map in the Map Editor.
  
• NOTE: Some things might look wrong. But it's probably ok.. Just continue with this...
  
• Set the Start Tile, and take a Map Screenshot.
  
• Save your Map! Set it to be Published so you can play it!
  
• Exit the game, and move the local ModTools folder that you copied, out of the Mods folder and into a backup folder somewhere..

• A mod you have enabled doesn't work in the Map Editor.
  
• ERROR: VirtualAlloc remappign failed: Fix Virtual Memory (Paging File).
  If you have problems with crashing, make sure you have the Page File on Auto

These mods below all work for me in the Map Editor for this conversion process. I usually Un-Subscribe from ALL Assets and mods, and re-subscribe to all of my Assets (from a collection) and all of these mods.