I had a similar problem (maybe not that big) and I solved it using a first layer height of 0.15/0.2mm. This way I'm sure the first layer works and then I can still use a 0.1/0.08mm layer height for the other ones.
Also, as @AreDigg mentions, the clips will hold the glass firmly to the aluminum plate and that will also help.
If you print anything with this glass, please share your experiences, I'd like to see which is the biggest tolerance in the first layer.
The clips will bend the plate somewhat anyway. I doubt you can get a perfectly even glass plate. As long as you calibrate and have a slightly higher first layer, it is not an issue.
If however you need the first layer to be perfectly flat, i.e. less than 0,05 mm, you are in the wrong ballpark.
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