Wow, that is a seriously impressive list! Cudos!
With regards to Explosifs, I have a 26" orange steel 2011 (which never appeared on Kona's website, but is identical to the black 2010 one) currently on duty as a single speed 4 season commuter running hope pro 2 hubs with wtb kom i23s and maxxis treadlites tubeless - this one also serves as trailer pulley and babyseatcarrier. I rode it as single speed and geared, rigid and sprung mountainbike as well in earlier years. Each setup was great. I totally get your view on rigid single speeding!
I picked up a mid-90s Explosif frame and p2 fork, which are not yet fully built up. The frame was cracked at the chainstay yoke, but a good friend of mine patch-welded it up nicely.
Finally I still own my first foray into kona cromoly - the blue 2003 scab. currently it serves as a truing stand, but i previously ran it with a 125-165 marzo 55 and managed to squeeze a 27.2 dropper post into the 27.0 seattube. That thing looked and rode like a tank.
Regarding the Ti Honzo: yes I was really lucky to get my hands on a used frame last year, for a killer deal. I had bought a new Smuggler frame only weeks before, but I could not pass that one up. Madness!
How's the Honzo with 29 x 2.6"? I recently bought a 29x2.6 minion/rekon combo, which came off of an oem setup, and will be mounted next season. Which fork are you running that can handle 29x3 up front?
I guess with the WC angleset, this combo really makes a huge difference!?
Thanks for sharing your thoughts, really appreciate that!