The BF862 has been End Of Life for about 10 years now. You can still buy them.
It's one of the more important parameters.Is cutoff the important specification?
Here's a parametric search for Digikey with Vgs(off) <= 2V and Idss of 5mA or greater.Any other JFETs on Amazon that might work? I typed in jfet as the search keyword.
if your Room temperature will be fairly constant, the E-101 current regulating diode from S is a super easy constant current source. It will hold 100uA at any voltage from 1 to 100v input.
Why? Could you link the datasheet please? That is a quad op amp from what I can see.Then there is the LM124/224/324 current regulator
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