For what they are those little Yanmar powered tractors are powerhouse work horses. I'd say any form of CAT delete on a common rail fuel system like that little Yanmar ( I think its common rail) would be a no go for the ECM. I run a 56 HP TYM with the Kukje engine for that very reason. It runs a DPF, and while it does have a regen mode its not a big deal at all. It runs an injection pump and no ECM so I can easily mod it if I ever want to eliminate the DP filter. I'm like you on the HST, I run an 8 speed w/ reverser but I'd rather just have a standard transmission if they still made them. Getting hard to find a good tractor unless you go back past 2013 year models and those boys know what they have.

Very hard to watch this video 😢

Im going to say something here that’s more than likely going against the grain: why not just get yourself a older tractor that is easier to “manipulate” into being exactly what you want it to be/do? I’ve done stuff like that before for about 20-25yrs of my 1st years to legally drive a vehicle. Of course, that probably explains why I drove my International 1/2T 4X pickup for so long as I did as well. I COULD fix anything on it because (compared to anything “modern” at that time) it was much more along the lines of the famous KISS principal: Keep It Simple Stupid! I really do/did like that truck, but it did suffer a few maladies that were addressed later on but better by a few of the other manufacturers out there. The biggest problem was body “cancer”: RUST! It’s terrible on most IH’s of the Scout/Pickup years which for the most part ran from the early 60’s through to 1980 for the very LAST year model of the Scout, while the very last year model for the pickup was 1975. Dad owned a 73 and I ended up with 5 total 74’s, a 64, and a 1600 Loadstar that was originally purchased by the USMC and went to Camp Pendleton.

DPF/Regen systems are a terrible feature! Tractors, skid steers, anything you may want to operate at low rpm, always avoid any piece of equipment with this option.