This thread about muni tires has a lot of good info it will be a good start if you have time to read it :). I’m pretty sure that tire you are looking at won’t fit on an older KH 29. You don’t need a 3" tire to get good grip, you just need a tire with tread. The short list of good tires… Maxxis Ardent 2.4, or Schwalbe Hans Dampf. Can’t really go wrong with either of those and they will fit.
Those pedals should work great.