Somewhat related I have long been planning to raise the nut of my 4 string 28.6" scale Mikro Bass, and turn it into a slide bass.
And I think I am going to go through with it next week.
Equipping it with Elixir guitar stings of the gauges .062 - .032 - .042 - .036 and tune it C# (as a baritone tuning) - C# (as an octave higher) - G# - B, for an open Minor tuning.
And just looked it up, seems like Sandman most of the time used an open D tuning, that is like the high D string of a 4 string bass in regular E standard tuning, and then the fifth above that A, like the low A on a guitar (though he did use other tunings as well):
Mobiusbandwidth.com Morphine tablature transcriptions
So as I questioned earlier, the standard E - A tuning and appropriate strings for that tuning that the Eastwood comes with, according to the specs they provided, is not authentic to what Sandmand actually played.