How to I "temporarilty remove" my DLC and mods...? Dwarf Commoner glitch.

Have you tried unchecking your DLC/mods via the "Installed Content" tab (Main Menu >> Dlownloadable Content >> Installed Content)?

Yes, I tried that, chose the "Force Load" option, but didn't help.  Thought about trying it w/ an earlier save and playing a bit leading up to the supposed cut-scene, but haven't bothered.

I'm also wondering about trying a 'mod manager' or something.

I've been reading a bit on here... sounds like there are a lot of problems nowadays and things haven't been kept up. 

If I 'move' any DLC files, I may not get them to ever work again.

There may be elements of mods in different folders depending on what the mod does, but the bulk will end up in the "C:\Users\<username>\Documents\BioWare\Dragon Age\packages\core\override" folder.

Generally speaking the game is pretty forgiving about items in the override folder; that is to say as long as it's in the folder it'll probably work even if you've organized the files by put each item into its own folder. Therefore if you want to temporarily remove something it's best to remove it from the override folder entirely.