Mooer expression pedal,small, cheap, well build.
the remote won‘t give you a wha neither, you will still need expression pedals. you can use any expression pedal, I like the mission engineering ones. later when you have the remote you can plug it directly into the remote.
or you get a used fcb1010 for almost no money (includes 2 exp pedals) and sell it again when you can afford the remote..
Yamaha FC7.
Pros: Cheaper (I think, haha, $40 new, less used), well-built, will last for a looong time. CKemper uses one. 
Cons: Very wide sweep, fairly large pedal/footprint.
I'd like something with a smaller sweep for wah, but at the price, no complaining from me, works great.
I bought a cheap used Zoom expression pedal for £11. It actually works better than my Mission pedal. It isn’t as solidly built as the Mission but it works like a dream.
I love the Yamaha FC7 as well. The wide sweep doesn't bother me, on the contrary. In practice, depending on how you set it up, it means either a fairly steep heel position or a toe position that is tilted forward, slightly beyond horizontal.
One thing to note about it is that the cable is hard-wired and only 1,5m long. Since you're planning to use it without the Remote, you may need an extension cable (female to male TRS) to reach your Kemper.
+1 for the moog. I've got that one and the dunlop dvp-3 and for wah I like much better the moog: the sweep is shorter than the dunlop's, and more similiar to what I was used which was a classic crybaby. For volume swells and all that I prefer the dunlop. 
Convert a craybaby into an expression pedal...
I switch between a Dunlop cry baby as an external wah pedal and a Boss FV 500-H expression pedal. For this last one I use only one wah fx from the Kemper and that's Frank Eltze's version.
But I guess any good expression pedal with this wah fx will do the job...good luck!
Is there a way to prepare an automatic wha following the tempo?
Funny you should mention that. It's something we've recently been discussing here:
So the answer is: not yet, hopefully someday.
