The best replacement for klingon is vulcan.

The best alternatives to klingon are rated as following:
★★★★★  vulcan
★★★★  romulan
★★★  wookie
★★  federation
★★  starfleet
★  esperanto
★  cardassian
★  jem hadar
★  krogan
★  jem'hadar
★  elvish
  hirogen
  mandalorian
  navi
  federation sto
  jaffa
  kazon
  ferengi

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klingon
vulcan
romulan