A) One can construct a connection between any 2 things, with a little creativity.
B) The verse you cited was Revelation 21:1. The word "sea" there, in the Greek, was "thalassa." Seems the New Testament usages of it are all literal of the type of body of water, a literal "sea." Strong's Concordance says nothing about it being metaphorical anywhere. Checking the usages of the word "sea" in the Old Testament reflect this also. Do you have a source for claiming that there's a "Hebrew idiom" that "sea" means "wavering of the mind" ?
If you don't, all of that is just exercise of the imagination.