The best replacement for tyrosine is phenylalanine.

The best alternatives to tyrosine are rated as following:
★★★★★  phenylalanine
★★  tryptophan
★★  l-tyrosine
★★  dlpa
★★  l-dopa
★  l-phenylalanine
★  tyrosine
★  l dopa
  dl-phenylalanine
  5 htp
  dopa
  l tyrosine
  taurine
  n-acetyl-tyrosine
  lysine
  theanine
  tyramine
  tyrosinase
  n-acetyl tyrosine

Your alternative for tyrosine is not listed? Suggest!
Speaking about tyrosine, one probably shouldn't forget about 5htp.

Other search terms related to tyrosine and their ratings are:
★★★★★ 5htp
★★★★ 5-htp
★★★★ phenylalanine
★★★ iodine
★★★ theanine
★ vitamin b6
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tyrosine
phenylalanine
tryptophan