I've been watching this for a while, Boodle, hoping for a reply. So far, nothing.
Can't you buy liquid sucralose (Splenda) at the grocery store? (EDIT: I don't go to the grocery store much, so I don't know.) Or just mix your own from the dry Splenda?
What about stevia? I know it comes in liquid form; I have some.
I wonder, though, if these would actually vape? They are dissolved solids. I don't have any answers here, just wondering. Would they be left behind in the vaping process and clog things up? I guess I could try; if no one who knows chimes in, I guess I will.