I think you owe it to yourself to at least try out a wa handle before you commit to a "forever knife" (good luck on that, btw! ;-) As others have mentioned, that will open up your options.
Lots of people (myself included) find the transition to wa not much of an issue. Especially if it's a knife that cuts well and you enjoy using--you may not be thinking about the handle very much.
There are various ways you could do that without necessarily buying a brand new knife (which still couldn't be ruled out). You could be involved in a passaround or ask for a loaner (maybe even some of the good folks who have already commented have something suitable), or you could buy a reasonable contender on B/S/T (which you would likely be able to use and sell for almost the same price if it turned out to not be what you really wanted).
I think that waiting to get your current knife back from Jon might also make you appreciate it more. We know it will come back sharp. I don't know if that particular knife is a candidate for thinning, but I would guess its performance will be significantly enhanced when it's returned to you.