Ways to reduce costs are to standardise bits and stop development races. Therefore keep all the bits Joe Public doesn't care about (structure, suspension, drivetrain) as control items and only let the bits which could keep manufacturers interested.
A ruleset similar to NGTC could work well, but with a plan going forward about how it shifts to full electric/fuel cell. Pick a body type (maybe promote SUVs?) specify engine size (Production based 3.0-4.0L to keep the noise there) then allow hybrid gubbins to be developed over 5 years, at which point it switches to full electric. That way the series can be sold to OEM's boards by saying it is in line with the product ranges and will allow development of the key items we are promoting (batteries, electric motors, charging solutions and control systems).
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