good for you I’ve also lived out side of my own country for along time.
You say you have lived out for 15 years so you have got one new full length passport in 15 years ?
And your also going to
Tell me that you
Need more then 6 months to apply for a DTV , but you can come with a month left ? No chance.
Chances are most country’s atleast Australia won’t even let you leave with less then 6 months validity.
Even most airlines won’t even check you in.
I know this because when I was working in Laos 4 years ago I tried the same thing to go back to work 1 day under 6 months ( thinking I could get a new passport whilst at work) with no success.