ORIGINAL: Mode One
Even if you seperate the parts glued together with 5 min. epoxy, you would never be able to remove the 5 min. epoxy from the parts epoxied. There would always be a layer of 5 min. epoxy sealing and seperating the 30 min. from the wood in the joint. In my opinion, this process would likely decrease the strength of the second glue job to less then the initial 5 min. epoxy bond.
gboulton is certainly entitled to his opinion. However, I would not hesitate to fly the plane as is and wouldn't worry about the strength of the 5 min. epoxy bond one bit.
Ditto! The 5 min has soaked into the wood somewhat and you will NOT soak any more Epoxy into the wood by de-bonding the 5 and using 30.
If you are truely worried about it, (I wouldn't be) then remove some covering at the glue joints and re-inforce with fiberglass tape. This will also give you the opportunity to add some customization to your plane as well by re-covering the wing joints with a contrasting color.