I completely understand your disinterest in installing anything else.
that said, if you do want basically the sound of the K&K AND to completely put the feedback issue to bed, the James May Ultratonic will do that. I have one in my OM-21 and can hold it right in front of my S1 at considerable volume with no feedback. it works to the specific anatomy and resonances of the individual guitar it's installed in.
For me, the effort to get it installed was well worth it. I had a years long love/hate thing with K&K in several guitars previous to that.
FWIW / YMMV....
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