its possible I am not sure. I did it the way I did because I was living here and had the opportunity to visit and experiance different parts of SE Asia every 90 days. Great little vacays. How ever you dp it I am sure you will have no problems. Good luck.
if you think you will leave before your visa is up sure metv is the way to go. But if you are going to stay the entire 60 +30 days why bother. I think metv more expensive than single entry.