Miller would've been the greatest ODI player of all time had he been born in this era. Legit opening bowler who would absolutely cane the bowling batting at #3 or #4 (or #7), especially with a modern bat. Procter would've been something to see too.
Out of the guys who actually played, I'd take Kapil for this role of #7 batsman and 4th or 5th bowler. Was an incredibly powerful batsman, and a very clever crafty bowler.