unfortunately having a spare part depot may be a little difficult in the sense of easily available ie slow indent parts. (some mechanical engine parts, etc)
this goes across to ANY grey imported cars too. as nobody is willing to indent parts stock on their shelfs; shelf space = cost. unless the car itself was locally assembled or locally manufactured, the manufacturer is obliged to stock parts.
suffice to say, at least my intention to form a tight knitted group amongst ourselves to persuade companies like wing hin to at least help indent some essentials like bumpers, renders, wind screen, head lamp , rear cluster lamp etc (not that they need much telling to how do their business but at least pointing out on
essentials or recommendations). and yes the above mentioned parts are in stock & available, the last i checked.
They are not obligated while you may think they (spare parts companies) will still "profit" when they sell, it only half truth, they could bring in more but I've been told to sometimes in business sense it wasnt quite worth it . as in the past poor planning & after being coax to bring in parts by a leader of a car club leader (which i will not mention here) whom promised that all members will buy from them. Of course it didnt quite turn out that way. (unneccesary parts ordered but nobody buys them)
so, they will only order those parts (if not available) upon request.
btw, other belts, ie air-condition belt etc are easily available in most spare part toyota stockist as they share common parts with altis corrolla (1ZZFE).