The static errors in the PA28 are pretty small in a sideslip, I can't see a particular problem there.
Personally I'd be more worried with pitot errors, when slipping close to the stall. Particularly if you use the ASI to figure out what your margin above the stall is, instead of the stall warner and the seat of your pants.
what PA28s don't do at-all well is get rid of energy in ground effect.
True. You will want to stop the sideslip and reduce speed to Vref or thereabouts maybe 50 feet off the ground, well above ground effect, and in time to setup the proper attitude for x-wind compensation.