If it were me I would have the bore and piston measured before I even honed it. If it's (IMHO) more than half of the tolerance spec, I would just get it bored and be done I:I. You're already worried about slap With fresh bore and new piston you're talking hundreds of hours if maintained properly B)
BTW, it only takes about 60 seconds to hone a cylinder
BTW, it only takes about 60 seconds to hone a cylinder