Those salts look wonderful.
Don't know about neat gold chloride but Silverprint in your neck of the woods carries premixed gold toners, as I can see.
Regarding conventional selenium toners like the KRST, my experience has been that the toner also bleaches the print, bringing the D
max down. The change in tone/color towards more neutral is also subdued. Presumably the bleaching is due to the presence of ammonium thiosulfate in KRST. I just received a version of selenium toner made by Wolfgang Moersch called MT16 (from The Photo Shop in Ireland, unfortunately no one in the US carries it) that does not contain the thiosulfate which he has formulated specifically for salt/VDB/Kallitype and the like to overcome the bleaching problem. I have not yet tried it so I can't give a first-hand report. He has a lot of examples on his website.
If you want to get exotic but easy/cheap where the results were actually better than selenium for my salt prints, try this:
https://www.photrio.com/forum/threa...out-black-salt-makes-a-terrific-toner.148338/
I don't think any of these though will be as good as the gold toner in terms of color change and D
max boost, not to mention the increased longevity.
Nice website and blog, by the way.
:Niranjan.