The combo car idea was successful back in the day and honestly could be successful again with the right combination
I think many of us ( myself included ) have over-analyzed this to the point of exhaustion when honestly the answer is very simple.
STAY OFF THE BIG TRACKS! and no need to worry about the HP / motor garbage
We are
talking about the expense of motors / etc. - this will never go away. Someone will always have more HP than the next guy. Someone will always have more $ and outspend the next guy. Someone will always be whining rather than working on their car and setup.
Go race at a small track, Dirt or Pavement and 99% of these problems will go away on their own
I assure you that it's most likely easier to find a smaller race track than to convince a bunch of racers to convert motor programs or try and institute restrictions, gear ratios, left side weight rules, hard tires and god forbid the club that changes the rules every dang week b/c someone actually wins more than once.
Just my 2 cents -