The A&P is not type/weight specific. If you can prove 30 months work experience and have n A&P engineer to give you a letter of certification then the hardest part of gaining an A&P is nearly over. The exam is a fairly straight forward memory test and shouldn't pose a problem for an already license engineer. You would have to go to the USA to complete the ground school which costs about $1000. It should take about 10 days....hope this is what you were looking for. This link from the FAA has more info
FAA Mechanic