I was Over-thinking it

Easier way to use On1PhotoRaw 2018 with Photoshop CS5.

Yes, still install trial version of CC, but don't subscribe , and leave it on  your system, as the TOS says nothing about removing it if you aren't going to use it. (I know, I read the entire boring thing) Install On1PhotoRaw 2018. It won’t install the plugins to CS5, so you have to copy all the plugins from CC plugins directory to the CS5 plugins directory.

Don't even bother with Adobe Bridge. This way you will avoid the "can't open javascript missing" error I posted about earlier, thereby using all the On1 Plugins. Use On1PhotoRaw only.  If you really want to use Bridge, open it by using a short cut. But you won't really need to.

Instead, using On1PhotoRaw as you would bridge. It will open on Browse module. Go into the develop, do whatever you want or need to do, then go to the bottom right corner of On1 and select EXPORT. It will automatically default to the folder/directory the RAW image was opened. Don't bother with any of the presets at this time, with the exception of may not having it open the directory it was saved to. Export it as a full sized, high res JPG. 

Go back to the BROWSE module. Right click on your JPG, select SEND TO OTHER APPLICATION, and navigate to the CS5 Photoshop.exe file.  Do this once, and CS5 will be listed in the drop down menu.  Then when you click on Photoshop CS5 12, select ORIGINAL image, because you've already done all the edits. It will open in CS5, and you can use all your familiar Photoshop tools and plugins, and use all the new On1photoRaw plugins too although I do have a problem when I try to use the RESIZE plugin in CS5.

So, your CS5 Bridge might not be able to read the newer Camera Raw formats, but On1PhotoRaw can.