Please explain "much more" regulated... If it's a switched PSU, it's switched, thats all... That means feeding the mosfets with a positive half-sine.
Hearing from you, the mosfets (=regulators) quality is better in pcp&c units, and extending them wont change anything for the signal quality. Remember, put *good* wire (>1mm, oxygen-free copper, thick insulation) to sustain the heavy currents and *good* solders for the same reason. The only problems you could get is from too thin wires or poor solders - and that would be wire burn-up.
In any way, it will certainly *not* throw off your regulation. The resistance of a wire is less than 1 ohm. Mosfets are surrounded by far heavier resistances and smoothing capacitors - 1 ohm is a drop in the ocean.
Putting wires is critical in HF or RF circuitry where EMI and small variations in resistance can produce bad results. A PSU is in no way a RF or HF part...
On the other hand If you succeed at sitting the WB over stock heatsinks - and if it's efficient enough - you've won some time and effort...
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