I collect fun props and figures, preferably free, in a range of formats, try to port them to Poser (11.3).

Unrigged props are easy. Between free Noesis, PMX Editor, XNA/Lara and ($$) 3DOC, most file-types will export to OBJ+MTL or FBX.

Rigged figures are harder: Poser is notoriously intolerant of recent 'open source' FBX rigs, results ranging from an oft-unwieldly zoo of sub-rigs to 'Splat'.

My 'Rule of Thumb' is the older the FBX format, the better. eg Mixamo's '2016' usually 'plays nice'. 
If 'Rigged in Maya' which, given its seat price may use the 'official' SDK, all versions usually work...

Noesis can usually port eg .MESH.ASCII figures (as-is or re-exported from XNA/Lara) such that importing their FBX to Poser only spawns a 'few' sub-rigs, typically body/base, then sundry clothes / accessories. It can go horribly, horribly wrong, spawning a dozen, a score, 30+, even 70+ sub-rigs. IIRC, my record was ~120. I gave up trying to wrangle those monsters via 'hierarchy', simply closed Poser...

Beyond the general woes of FBX, Blender 2.7x had a specific 'gotcha': Iteration of its app versions and plug-ins sometimes provided a brief sweet-spot. Using identical workflow, similar FBX figures port badly to Poser, then perfectly or good-enough, then badly again, and there's no clue to why. One artist's series of ported figures suddenly began working well in Poser. They were okay for about six weeks, then reverted to 'Ick' when a Blender plug-in updated. So sad...

And now there's a whole new Blender version ??

Down-side of Blender & DS is their quirky UIs give me a prompt migraine. So, per XNA/Lara, I only use their I/O tools...

Is there a robust work-flow for getting pre-rigged figures from Blender format via FBX to Poser such that they 'Play Nice' ??

Is Blender's 'bundled' FBX tool reliable, or is something like 'Mesh Online' $$ plug-in more idiot-resistant ??

https://blendermarket.com/products/better-fbx-importer--exporter

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FWIW, even respecting generic ban on porting MMD TDA figures, there seems no easy way to get rigged PMX figures into Poser.
IMHO, re-boning in Blender is not a good solution. Is there an FBX-I/O plug-in for PMX Editor ??

Getting a Rigged Poser characters into Blender there are a few different work arounds you can use to get them to work Blender can usually import FBX from Poser as long as you make sure you you turn off IK zero your figure and export as FBX also have found that the Alembic works rather well also now going from a rigged Blender character to  Poser presents a number of issues the primary one is Poser's native scale is based on inches but even then it does not seem to conform naturally with other 3D software If I recall right the Maya and Cinema 4D FBX workflows with Poser seemed to work the best but this is going back to the Poser Pro Game Dev version. I do not do much Rigging but when I export FBX from Blender into Poser in Blender's export options I only select the minimal things I need for the character itself see screenshot below other than that which is a bit time consuming is rigging the character in Poser itself.  I have looked at the product you that is available on Blender Market I can not speak if that would help or not it looks promising but have no experience with. I am sorry I know I probably did not answer your question but hope that the general info helps to some degree.

Thank you for your thoughts.

My understanding is that improving Poser's generic FBX-import must await 'resolution' of unimesh rigging and its complex cascade of consequence.

So, until then, FBX files must be offered to Poser with 'Due Care'...

Your welcome NikKelly but I would point out that even current Daz Blender bridge is having issue due to changes with in the Blender 3.0 and above python updates so some FBX issues are not just isolated to Poser I will say that compared to 5 years ago Blenders development getting so much better and I believe many of these things will be overcome it is mainly finding a workflow that works best for you and people are always discovering workarounds that help. Just a matter of finding some of these hidden gems of knowledge