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I don't know what the powered circuit is, but all regulators are not created equal.
They can have enormous phase & impedance non-linearities that really screw up the sonics.
I can assure you that attention to PS linearity pays huge sonic dividends.

This thread from 2009 goes into the detail.


As far as the PSU, why not parallel a high current winding feeding a simple transistor regulator with a lower current precision one.
After the appropriate time, the high current can be shut off.
To avoid a transient, kill the high current winding input at the line zero crossing

More complicated in some aspects for sure.
As simple as possible in others

Cheers,

- Ian