In response to requests, I’ve finally updated my plugin for the 4-axis XHC HB04 pendant. I switched to Qt5, which allowed me to fix a lot of the shortcomings of my original version.

You can download the new version here:Dropbox

This supports both the wireless and wired versions of the 4-axis pendant.
I’m offering it to the community free of charge because I can't bring myself to exploit a situation where the vendor refuses to support their own product. (Though if XHC wants to pay me...)
Before you ask me to modify the code to support your 6-axis pendant, understand that it's not a trivial undertaking. Since other plugins already exist for the 6-axis version, I will likely say no.

Thankyou to user lesspaul for assisting me in testing