Any way to build and submit a unity 3.5 project to appstore after Xcode6 became minimum requirement?to

We have a old unity 3.5 project, which we need to modify and resubmit to appstore.

To my knowledge unity 3.5 wont export to xcode6 and appstore demands building with xcode 6.

But it will not be trivial (to say the least) too update to e.g. unity 4.6, which does support export to xcode6.

So any good ideas / workaround on what to do?