Re: HV regulation.
2N3585 is another worthy HV transistor to look out for as series regulator if there's not too much dissipation- again, combining its high voltage rating with decent current gain so that its error amp doesn't have to use too much brawn. Comes in a quaint but "proper" metal package (TO66) but, as so often with superannuated and unusual transistors, may be pricey and tricky to track down.
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