As suggested above I'm reading between the lines of their email to say; we could do this, but we're really not very enthusiatic about doing it. Find somebody else.
Hypothetically, if I were to ship the camera to the US from the UK what kind of taxes etc would I need to pay to export and import after work has been done? Would I need to pay VAT on the value of the work done or value of the camera when it re-enters the Uk?
In the meantime the M2 can live in the bottom half the the eveready case with its strap attached to the case.
Another option would be to buy a donor eveready case and undo the stitching and use as a template to make a new case from leather and strap attached as above.
Quite unbelievable nobody makes a half case with the strap attaching to the case directly anymore.