For RB what about Bill Tuiloma??
Signed with Galaxy, is a great athlete with good technical ability.
Perhaps give him a run and see how he goes??
Also what about Michael Fitzgerald the forgotten man of NZ football. Had one good game and one shite game. Has done really well in the midfield role this year (albeit being loaned out to a lower league team in Japan) winning promotion.
Coming from a Japanese football background, technically and athletically he should be competative with everyone else we have.