One mag & reducing the blower overdrive would be a quick change... Fuel pump gears are easy too...
Ultimately in a few of years, maybe a 400+ ci. engine...the cranks are now replaced in 8-10 runs , the pistons would be the same , rods are replaced daily, plus the excess inventory can go to the track pullers...
The parts cost argument is a "Red Herring" because of the current replacement rate of parts, they need a second truck to haul them now... The different pieces would cost the same if ordered in advance - pistons ,rods ,crankshafts , blower pulleys , magnetos all cost the same... If you go to one mag the replacement costs are half, including half the plugs...
If you slow the blowers to under 20% they wouldn't have to be stripped as often... Blower technology is one of the biggest improvements in recent years that would be the thing to change first... A four disc clutch would reduce rear main bearing problems and eliminate some replacement parts...
Best is, if they make a big reduction, the tracks can be 1320 again ,plus tire chunking past the 1000' would be eliminated... Tires are now $1600/pair, getting more than two runs would also reduce costs...
The knowledge to reduce speeds is available , it's the will of the big teams to spend for new data acquisition that isn't forth coming... Tune-ups are sacred right now...