Alright, thank you for your help
I do believe I can speak enough Malay to get around however my main concern is the 110 CC law as it's never enforced. I've been stopped on a 150, 300 and 500 with no problem in Thailand however I'm not too sure how the Malay authorities would handle the situation
Also regarding the rego, I'm sure I can get a letter stating that I have permission, should also be easier as it's in the same family name