Finally I took a jump, contacting the National Library of Australia (through their "Ask A Librarian" ASPX page, whoa ASPX - you definitely need to turn on the Internet Explorer mode on Edge)... about using out-of-copyright maps of pre-independence Malaysia (were British protectorates/colonies) in their collection; to improve OSM in parts of Malaysia.
It was a "yes" but it's Friday night over here and it was a busy week.
Glad to see you tooting again, @AkuAnakTimur ! And with good news too! :D