Theres no absolute law on offset. I know people who have fitted ET20's onto Audis. But you run the risk of upsetting the handling, tracking problems, fitment etc. I think the lower the offset the wider you will push the wheels out giving a wider track.
So if I understand correctly on ET35 your wheels will push outwards towards the wheel arch. Add in the wider wheel and according to the calculator I provided you are looking to move each wheel towards the outside wheel arch by 29mm.
So you will need to check you have enough space to tolerate this movement. Don't forget your tyres should not protude beyond the wheel arch. That is illegal and a nice policeman may be tempted to have a word. Of course fitting wheel arch extensions gets around that.
Personally I'd take a punt on ET35, but that's not a reccomendation, endorsement blah blah blah. Get your tape measure out
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