One thing you could do, just to get your feet wet (and adjust for preferred tension later, ordering custom sets from Pyramid as suggested), is buy a 6-string set, from which you'll discard the second-lowest (the E string), with the following gauges:i havent´t found that set
25~30
40
60
80
100
120~130
Tensions will be nicely balanced (check them against the aforementioned Stringjoy calculator), but lighter than suggested above (30~35 pounds), but not at all outside the range of what is commonly used (more or less like a 095 low E on a standard long-scale bass, or a 100 on a short-scale one). Plus, it will have some of the familiar sound of detuned strings in metal.
Here are some sets with the above specs:
Galli RSB30125 Rock Star (RSB61) Bass Electric 6 string
https://www.thomann.de/de/marleaux_bass_strings_6.htm
Medina BE156N MAGMA E-Bass Professional Series light (30-125
Pyramid 982 Nickel Plated Steel Bass 027/126 6-String, 47,90 €
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