The best replacement for bosal is walker.

The best alternatives to bosal are rated as following:
★★★★★  walker
★★★★★  hackamore
★★  side pull
★★  bitless bridle
★★  eastern catalytic
★  ansa
★  snaffle
★  starla
★  westfalia
  klarius
  eberspaecher
  snaffle bit

Your alternative for bosal is not listed? Suggest!
Speaking about bosal, one probably shouldn't forget about mecate reins.

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



Google Trends

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bosal
walker
hackamore