I've a set of these (passives) in a P/J and the tonal range is pretty good, although I also use a @KiOgon VT+VT circuit which no doubt helps. The Dimarzio configuration also allows for series/parallel (which I don't use) which could add to the range further. @KiOgon would no doubt be able to accommodate that for you
https://www.thomann.co.uk/dimarzio_dp126_creme.htm?gad_source=1&gad_campaignid=1581403900&gbraid=0AAAAADuDMCVsgt3nuIAmWBp8w-ZIRu_lG&gclid=CjwKCAjwtrXFBhBiEiwAEKen13q8gI4Wbnp-qssTHm2S5XJAOeQ4RSDaRgl1NZCcBpIFOv_uLYc_mhoCCAIQAvD_BwE
Re routing the body for humbuckers, you might just find that the thing that has kept this bass as a preferred gigging instrument gets lost in the mods