Have to disagree, especially playing with an 8 string guitar. Get the 5er, 34" scale, tuned BEADG, and just get used to it. The fact that it feels so much different will encourage OP to play it like a bass, rather than like a long scale guitar. The world doesn't need more bassists who play like guitarists.
Damn, I thought you were going to say, “the world doesn’t need more guitarists who think they can just pick up a bass and play like a bassist.” But since you didn’t, I just did.

