You could reasonably invoice an upfront tooling cost ("isolated development workstation to meet customer IT policy requirements. Apple Macbook Foo, $BIGNUM")
If you want to be really cheeky, could get some value-added margin on it too, and as a bonus, AIUI it would be yours to keep after the engagement, rather than having to return hardware they've assigned to you.
Might be tough to get past finance though, unless they really want that certification :)