You could try tuning it AEAE. I've just converted an Ozark six string guitar to a guitar bouzouki by adding extra machine heads. It works very well and can be seen on my YOUTUBE site.
I even contacted the chaps at Ozark to let them know what I'd done and found they have just started to make a Guitar Bouzouki themselves priced at £450. Dave Carroll at Ozark sent me some pics of it and it looks very nice.
There is also a lot of info on Greek Bouzoukis, lessons, tunings etc on YOUTUBE.
Hope this helps