For Polymorph Self and Shapechange, none of your item properties transfer over as well. Equipment, nor weapons.
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Is there anyway to make this work with a build like 20 barb 10 wiz to buff and polymorph?
A barb who can cast a few spells might be cool, but polymorph really isn't going to help you out there. By the time you're mid to max level, the current Polymorh forms make you a sitting duck, because you end up throwing away all your Saves and AC. Shapechange is a little better, but that is only because most of the shapes have tons of temporary HP. Even then, your saves and AC will be heart-breaking.
That isn't to say not to do it. If you have an idea and RP worked out, why not give it a shot. Most people would suggest Barb and Sorc make a more thematic pairing, but a noble warrior-scholar might be neat. Just be aware you cannot cast spells while Raging. But you can enter Rage while in a different shape, I believe.
If you really are looking for a sort of wild, rage-er-riffic shapechanger, Druid/Barbarian may indeed be a more function route to go. Shifter gives you better shapes as well, that hold onto most of your equipment stats when you shift.