The best replacement for venturi mask is nasal cannula.

The best alternatives to venturi mask are rated as following:
★★★★★  nasal cannula
★★★★  simple mask
★★★  nasal prongs
★★★  non rebreather
★★  hudson mask
★★  high flow mask
★  rebreather
★  aerosol mask
  venturi mask
  nonrebreather

Your alternative for venturi mask is not listed? Suggest!
Speaking about venturi mask, one probably shouldn't forget about humidification.

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



Google Trends

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venturi mask
nasal cannula
simple mask