The best replacement for vowels is consonants.

The best alternatives to vowels are rated as following:
★★★★★  consonants
★★  short vowels
★  vows
★  long vowels
★  consonants worksheet
★  constants
★  english vowels
★  consonants phonetics
  silent e
  short
  lax vowels
  words beginning with vowels
  back vowels
  consonant
  consonants worksheets
  consonants english

Your alternative for vowels is not listed? Suggest!
Speaking about vowels, one probably shouldn't forget about r.

Other search terms related to vowels and their ratings are:
★★★★★ r
★★ r words
★★ y
★★ symbols
★ r worksheets
w
final blends
words
name
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vowels
consonants
short vowels