With forged pistons your cylinder to bore clearance is a lot more crucial, using a dunny-brush hone and hoping for the best is a patch up job at best. Unless the bore is perfect currently I would personally be looking at boring over-size to get the clearances perfect.
Bearings is debatable, again I always replace them anyway. As far as I know there's no pistons that will slot straight in as a high comp equivalent, CA18DE or BP Mazda are what I've using in the past at 83mm bore.