Not interested, I guess where we differ is that I don't see the point. . Don't see what this would add, in my view other than in a few applications (solo bass, maybe a prog rock 3-piece band), I think that it would detract from the overall sound of most bands and how I view the role of a bass player (all in my own opinion, of course). As bhloder states, there are diametrically opposed views of whether this style of playing/instrument fits into the role of a bass.If you can make your 5-er and 6-er sound like a rhythm guitar and bass all at once then wow! More power to you!
I’d love to hear a sound sample.