Hmmmm… I suppose I should have posted a followup to that 14-month old post, to say… It was, in fact, easy to change/recompile the firmware with slower electronics fan speed for my “old” mini. I also added a secondary cleaning sequence to the “re-wipe” code (i.e., the part called to re-wipe the toolhead if the initial probing fails) to clean off the fibers left from the stock cleaning pad – more info about that here.