I did test setup myself and liked result, then i took it to luthier. He installed stereo jack on the of660 and combined in it Lace and stock piezo.
When the regular mono cable is plugged in the guitar, it takes signal from lace, but wth Y splitter stereo to dual mono, signal from piezo pu also can be retrieved. So there are no additional holes or buttons and instrument can be reversed to stock setting.
With TWA on of660 it can be installed right behind the soundhole so there is no need to reach deep inside. I am still in the search of sweet spot to position twa.
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