The best replacement for regulators is conformers.

The best alternatives to regulators are rated as following:
★★★★★  conformers
★★★  moderators
★★  desperation first
★★  desperation
  dual stage regulators
  scubapro
  oxygen conformers

Your alternative for regulators is not listed? Suggest!
Speaking about regulators, one probably shouldn't forget about hoses.

Other search terms related to regulators and their ratings are:
★★★★★ hoses
You have in mind a companion for regulators and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of regulators in all years. Click on graph for more.
regulators
conformers
moderators