dac I/V convertion with very low distortion

17 mA will give you a function time of app.. 8-10 hours on at 9V rechargeable battery...But of course some kind of charging system could be made.. Normally I would defer any switches in the signal path....I am not really sure this is in the signal-path, as it's floating around...🙂
 
the CEN baxandall super pair.

this is only a test circuit, just to give you an idea, not a final circuit.
 

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I worked with Malkolm in the 90th. I know his work well.
This BISS transistors are really special. Not much voltage they can stand but a lot of current !
I would still try one of your circuits an an input stage for a phono. I could not stabilize the first circuit i made. What do you recommend i could try ?

I think you should try snubbers, there are some examples in some of the circuits i post. try the nodes that i call UP and DOWN, or at the input, but it help if you post a circuit.