You've clearly thought through the recording scenario well..and all your proposals appear sound and solid.
You might want to get a pair of functional (not necessarily expensive) lavalier shirt front mics, to either supplement or replace your beyerdynamic mc930. These could be recorded directly to your H6. These will give you a more direct, less roomy sound than the beyerdynamic.
Alternatively aim for very tight shots which allow you to get your stand mic very close....either above head height pointing down or waist/chest height pointing up. I think you'll be surprised (despite use of goboes, room treatment) how little regular mic distance you can get away with, before the "room starts to intrude"....hence the lavalier suggestion.
If you're wanting 2 'talking heads' consider the alternative of attaching a lavalier to a mobile phone in a back pocket, and recording to that. Most phones are perfectly good recorders for your intended purpose...the Rode Lav series are respectable performers for this task. You'll need to sync the voice track(s) in post...but you'll have your on-camera mic to serve as the reference for that.
Here's an example of a useful kit:
https://www.videoguys.com.au/deal-zo...eid=c8cb666f2c
A single MC930, while probably suitable for 1 subject, is unlikely to be able to successfully usable for 2 speakers (unless you're going to be boom poling)...hence the Lav mic suggestion, for at least one subject if not both.
Lav mics for dialogue are a huge load off your mind...and you'll have plenty of other stuff to keep you occupied !