As others have mentioned, he's too young to be working about this. Give him at least another two weeks, more like four or six, before you can expect to use rewards like this. At this point you're pushing on a string. Once he gets a little older I'd have lower value treats -- Charlie Bears or even kibble -- for run of the mill treats.
I'm a boring broken record but ten weeks is too young for a placement. They're just not ready for such a huge transition. And your potential mistake is in letting him know that you'll negotiate with yourself -- meaning if he rejects one thing you immediately come up with something else. You do not want him to reach this conclusion! LOL
Most dogs like either treats or toys, sometimes both. But I've personally never known a Basenji who likes toys more than treats. Usually they are super food oriented. So your basic idea is sound. You may just be a bit premature.
Using rewards rather than punishments is definitely better, though sometimes it takes some thought to figure out how to do this when you're really looking at stopping a behavior. For example, I have never come up with a good way -- other than age -- to stop a Basenji pup from lunching on shoelaces. If you have an idea let me know!