What I did once, I bought something using CC, then called the bank, ask them to convert the purchase I just made.

They did that immediately, 0% interest free for 12 months, but there's 3% one time service charge, that's it.

So if the purchase is RM1000, the monthly installment is (1000 + 30) / 12 = RM85.83

Don't know about other CC, but Public Bank can, and I think also Citibank.

If the shop already provides bank CC installment like GH, there's no 3% charge though. Better go there instead.