This is a stupid idea. Do it once and properly and install an ABF on OEM management. G3 16Vs are now cheaper and easier to find than G2 16Vs.
As for not declaring it.

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yeah maybe in hindsight id have gone for the digi rather than kjet, but didnt know that at time, plus it means getting a mk3 donor car for the conversion, whereas i figured buying a mk2 would mean everything was guaranteed to swap over, and i wouldnt need anythin else.. thought that a mk3 might be more aggro with different drivetrain etc etc. it still makes 160bhp - and the kjet gear seems ok for now, if it really plays me up in time ill find myself a digi loom and swap it over...
as for insurance they wanted an extra 250 per year for the 1.3 - 16v, and at the time, with tax engine conversion costs etc i just didnt have it to spare... will be doing it on next years in a few months tho, as its not even £1 a day so welll worth it...