If you look at e.g. Mean Well AC-DC supplies, they tend to top out at 48V because they tend to be universal (85 - 264 VAC, 120 - 370 VDC). For similar reasons, there does not seem to be too many AC-DC or DC-DC supplies with output in the range 55-100V.
I believe (but check with the more experienced members here, I'm just a hobbyist) that using two Class II isolated 48V supplies, like Mean Well HDR-15-48 (DIN rail mountable units that you can buy from e.g. TME for 16€ apiece, or Mouser for 17.25€ apiece) in series would give you 96 VDC. Each can be adjusted between 43.2V and 55.2V, so you should be able to adjust the combination between 87V and 110V.
I also asked TI Webench on suggestions for a 5-12VDC to 96VDC 100mA boost converter, and it provided several designs based on chips like LM51561H that would yield better than 85% efficiency at 60mA.
Where’s your joke detector?
I COULDN'T HEAR IT GO OFF BECAUSE OF THE SHOUTING GOING ON.