Even saying "small points, battle-forged, no cheese" you can end up with some bizarre and unpleasant matchups. Depending on the armies you'll probably want to just hard-ban formations (alternate detachments are more reasonable given the number of armies that don't work without them), and I'd suggest constraining unit types somewhat (start with no superheavies, flyers, or MCs, start feeding them in slowly as the campaign goes on).
The Heresy books have some campaign ideas, there was also a 4e-era slow-grow campaign that among other things restricted how many points you could spend on an individual vehicle and then raised the limit as you captured territory. Going to see if I can't dig that up.
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