I use MD only, with the MDBridge for Poser. No other apps. If I need a conformer or a hybrid I use MD9 to make the mesh and texture and process in conjunction with my 1-2-GroupIt for La Femme script. (I have a version for PE also) It groups the mesh for LaFemme with the body part groups I select in a small GUI. I can then check the grouping and fix if necessary in the group editor. The script also generates a hierarchy file that I can use to make a figure from the prop with just the bones that are needed. I then only need to copy joint zones and morphs from the dev rig to get me on the go.

This usually suffices. I usually can forego on JCM correction because I either make invisible what is inside, use the morph brush or use an end drape (1-2-Drape-it script) that runs a short cloth room sim on a unimesh copy of the posed garment to fix poke-thru and improve drape. 1-2-DrapeIt also works on existing conformers, so it is easy to mix new items with existing converted stuff.

This may not work for garments put for sale but it does the trick for my own projects.

I made this because the fitting room is poor on auto grouping and it does not allow you to modify the grouping until much later in the process with much more repair work. Also it does not separate bone generation and grouping, it exports a cut-up mesh, and is less good in morph copy.

I realize it is much personal toolkit. Not sure if it is of any help for the OP. I just wanted to illustrate a way of working between Poser and MD. I will be happy to share scripts with anyone interested but keep in mind these scripts are not ready products.