The days of 2 strokes that need top end rebuilds every 5000 miles are even more than decades old. I got a Yamaha FS1E in 1976 and put 17k mikes on it without a "rebuild". I did pop the head and barrel off just before I sold it and replaced the piston rings - quick and simple job - but that was just because I was selling it, not because it really needed it.
I did 26k miles on my Kawasaki KH 250 between 1977 and 1979, without ever having removed the barrels.
My sons 50cc bike has do e about 6000 miles and seems barely run in and runs beautifully - even though it has been de restricted and buzzes along happily at between 10k and 12k RPM's, with total reliability.
Don't listen to old wives tales - buy a good-un and a 2 stroke will give you years of trouble free commuting.
Buy a dog and at least a rebuild is quick, easy and cheap, compared to a dog 4 stroke.