NATO should incorporate a "subset-NATO" status in which Sweden and Finland would have shared protection with all NATO members that wish to align with a candidate "subset-NATO" country. This would allow Turkey to not have any obligations to protect (or to be protected by) a "subset-NATO" country while allowing other NATO countries to make their individual commitments. Turkey would then realize the futility in blocking their acceptance. This could also be helpful when addressing future NATO candidates.
NATO should incorporate a "subset-NATO" status in which Sweden and Finland would have shared protection with all NATO members that wish to align with a candidate "subset-NATO" country. This would allow Turkey to not have any obligations to protect (or to be protected by) a "subset-NATO" country while allowing other NATO countries to make their individual commitments. Turkey would then realize the futility in blocking their acceptance. This could also be helpful when addressing future NATO candidates.