The funny thing is, all these guys have options remaining, except Brice, who may be the worst or 2nd worst of the group, so YES, add 2-3 RP'ers and use the bottom 3 as AAA depth. As we know, teams usually use 16-22 RP'ers during a full season usually 8-12 with significant innings.
I'd rather use Brewer, Brice and Springs as our 9-11th RP'ers than our 6-8th.
Other AAA depth RP'ers might be Walden, Bazardo, Shawaryn, Feltman, Poyner or Mazza/Weber/Mata/Seabold/Hart