The best replacement for 7 string guitar is 6 string.

The best alternatives to 7 string guitar are rated as following:
★★★★★  6 string
★★★★  8 string
★★★★  6
★★★  baritone
  6 string guitar

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Speaking about 7 string guitar, one probably shouldn't forget about 4 string bass.

Other search terms related to 7 string guitar and their ratings are:
★★★★★ 4 string bass
You have in mind a companion for 7 string guitar and it is not yet here? Propose!



Google Trends

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7 string guitar
6 string
8 string