Sorry, I'm still not entirely sure that I agree that this doesn't count as tracking on behalf of Microsoft. If their browser has an "if MSTracker then allow else doNotAllow", that still seems like it's effectively endorsing MS tracking.
That said, I agree with your criticisms on Kagi (as outlined in sister thread). It would be ideal if Kagi had some means of truly decoupling searches from accounts, but as I stated, at least Kagi charges a fee so they have a means of making money without mining and selling data.
Which Firefox fork do you use? Does it work on iPhone? I would really prefer to use something that allows me to install extensions like uBlock.