Bypass pipe ?

Going from one pipe to two pipe means the radiators will be more efficient. Therefore, if anything, they will end up being oversized and able to heat the house at lower flow temperatures.
The output of a radiator varies with water temperature but it is always 100% efficient.

Yes the rads may be oversized but the rads farther from the boiler could be more oversized. Swapping rads would help balance the oversizing.
 

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