Your dream scenario (Fernandez at 28 and Byars at 33) isn't much different from mine. It's likely that the Spurs wouldn't be able to add two more players to their current roster, so one of them just might be a foreigner...and none is better at #28 than Rudy. He could stay overseas for one more year, wait until the contracts expire for Barry and Fin, then come over for the 08-09 season.
Byars/Dudley/Fazekas probably wouldn't get much "burn" either, but they'd be there for the long-term future of the Spurs and would hedge against possible trades or departures in FA (Barry, Fin, Bonner, Ely, Oberto).