I only have SE version, but that is a good question, that I approached the other day as I found a sound that had a perfect set of inserts but I wanted to change the layer soundsource.
I gave up quickly, but i wonder if you need to rescan the preset database by clicking the root folder of HalionSonic, and trying to type in the term of the source you want to use?
I am curious now if you can load the soundsources, as as far as I’m concerned (+5 points, 3x as in a sentence!), the soundsources are simply separate patches. I have seen some that I have used stadalone in HalionOne as part of larger patches in HSE if that makes any sense.