You have two options as you noted -- if you want to capture the PN directly inside of iClone (using Motion Live) you need both Live as well as the plugin. Otherwise you can export from the PN software and bring in via 3DX (you don't need pipeline -- the regular edition will work just fine).
I do it both ways but, honestly, capturing it outside of iClone is MUCH easier and works better, IMHO. I've pretty much given up doing it in Motion Live (there are reasons you might want to do it that way, but it's SO much trouble I'd just stick with importing. I can do into the various reasons and details if you want, or you can take my word for it :>
Again -- you don't need 3DX Pipeline (that's only for the OTHER direction). The "regular" 3DX will import to iClone just fine.
Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley