I can't answer all of your questions. But here's what I have.
Compare the NerdSeq to the 1010 Music Toolbox sequencer. See if one workflow is better than the other. I think the Toolbox will be better for instant gratification but the NerdSeq will be better for building songs.
The Expert Sleeper FH2 requires configuring before you access it with your DAW. If you wish to reconfigure it, then you have to quit out of your DAW, open the browser interface, make your changes, load up your DAW again and see if the changes are to your liking. You can make changes via the module's front panel. But the menu'ing system isn't that intuitive. That's been my experience. I would take this into consideration unless they've improved the USB interface.
Instead of a 2HP LFO, have you considered a 2HP switch instead? Being able to switch between different modulation sources might be more useful than another LFO.
Slew limiters are great. Being able to plug in a simple CV sequence and then slew between the values at a slow rate might be tasty for drones. The Rampage or Maths work well at this with individual controls over rising and falling CV. Both can also be used as a basic envelope generator as well as having comparative or even mixing functionality (Maths). If you have the space, one of these is a great utility module to have about.