The best replacement for tariff is quota.

The best alternatives to tariff are rated as following:
★★★★★  quota
★★★  tax
★★★  duty
★★  subsidy
★★  non tariff barriers
★  import quota
★  consumption tax
★  free trade
★  excise tax
★  non tariff
  import duty
  protective tariff
  ad valorem tariff
  levy
  rps
  no tariff
  embargo
  quotas
  nominal tariff
  revenue tariff

Your alternative for tariff is not listed? Suggest!
Speaking about tariff, one probably shouldn't forget about contract for difference.

Other search terms related to tariff and their ratings are:
★★★★★ contract for difference
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tariff
quota
tax