Hmmmm....I don't think the type of finish matters so much as the preparation since magnesium (from any manufacturer) needs to be treated carefully with the right processes and chromate undercoat as well as being crack tested.
Frank is right, Dymag off a refurbishment service for mag wheels from any manufacturer and this is what they say (copied from their site):
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Customers are advised not to attempt to remove the finishing systems that have been applied to Dymag wheels..
PERMANANT DAMAGE CAN RESULT FROM INCORRECT USE OF CHEMICAL PAINT STRIPPERS OR BLASTING MEDIA..
The Following refurbishment service is available from Dymag
Strip coating back to bare magnesium
Conduct dye-penetrant inspection
Apply chemical chromate coating
Repaint
Replace bearings & assemble
Final visual inspection
Please email us for more details and prices on this service. Collection/Delivery time is : Typical lead-time is two weeks from receipt to despatch Note: If at the Inspection stage a wheel is found to be cracked or damaged beyond use, a charge of £15 + VAT will be made. If the customer then requires the wheel to be returned, it will be drilled prior to prevent further use.
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I hope your 'strippers' knew what they were doing mate...hope it works out OK