I know of a website that has downloads of legends in my player mode. It seems safe. I've used it myself, and it work's perfectly.
Link:
http://basketball-pics.blogspot.com/201 ... layer.htmlThis website doesn't look trustworthy, but appears to be to me. I hope this helped!

Edit: Found regular NBA Players in My Player Mode (A Total of 65)
Link:
http://nba-2k.com/nba-2k12-65-my-player-patches-pack/Includes:
Andre Iguodala
Evan Turner
Andrew Bogut
Brandon Jennings
D.J. Augustin
Kevin Garrent
Paul Pierce
Rajon Rondo
Ray Allen
Antawn Jamison
Eric Gordon
Blake Griffin
Derrick Rose
Taj Gibson
Dwyane Wade
Lebron James
Chris Bosh
Chris Paul
Davin West
Emeka Okafor
Dirk Nowitzki
Jason Kidd
NENE
Ty Lawson
Wilson Chandler
Dwight Howard
Jason Richardson
Brandon Roy
Gerald Wallace
Lamarcus Aldridge
Ben Gordon
Andrea Bargnani
Kevin Durant
Russell Westbrook
Serge Ibaka
Steve Nash
Andrew Bynum
Kobe Byrant
Lamar Odom
PauGasol
Rudy Gay
Zach Rondolph
Davin Lee
Monta Ellis
Amare Stoudemire
Carmelo Anthony
Kevin Love
Michael Beasley
Wesley Johnson
Demarcus Cousins
Tyreke Evans
Manu Ginobili
Tim Duncan
Tony Parker
Brook Lopez
Deron Williams
Kevin Martin
Kyle Lowry
Joe Johnson
Josh Smith
Danny Grange
Paul George
Al Jefferson
Paul Millsap
Javale Mcgee
John Wall
Nick Young
Your question about getting legends onto regular NBA Teams? Just download HAWK23's Ultimate Base Roster. It allows you to trade or assign legends to regular NBA teams.