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You're adding it up correctly Jeff, but remember that your T-Ring will also add about 11mm backfocus (to add up to 55mm), so you're actually at 86.5mm.
As to solutions, well really you'd have to either use a lower profile T-Ring and filter drawer (former exists, not sure about latter), or just thread the filters right onto the flattener. It has M48 threads I believe.
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