There have been various calls for a common exchange rate policy, usually based around targeting a common basket, though to my knowledge there is no action plan currently available. (rba.gov.au)
Hence it seems unlikely, to me, that an Asia - wide exchange rate policy is likely any time soon. (rba.gov.au)
Most likely exchange rate policies will continue to be made with reference to the US dollar for a while yet. (rba.gov.au)