Shorter Rage List? (Battle)

The only advantage Rare item bits have over regular event bits is that they turn on a display in the item menu... which IS advantageous but maybe not for this.

As for testing for Gau, the spot in question is less complex than I remembered.

Code:

Test Reequip activation, select menu commands accordingly
C3/9EEB:    201091      JSR $9110      ; Get gear effects
C3/9EEE:    20F293      JSR $93F2      ; Define Y
C3/9EF1:    B90000      LDA $0000,Y    ; Actor
C3/9EF4:    C90D        CMP #$0D       ; Umaro?
C3/9EF6:    F007        BEQ $9EFF      ; Branch if so
C3/9EF8:    205C9F      JSR $9F5C      ; Test Reequip
C3/9EFB:    A599        LDA $99        ; Triggered it?
C3/9EFD:    D007        BNE $9F06      ; Branch if so
C3/9EFF:    A904        LDA #$04       ; C3/1A8A
C3/9F01:    8527        STA $27        ; Queue main menu
C3/9F03:    6426        STZ $26        ; Next: Fade-out
C3/9F05:    60          RTS

And

Code:

Determine whether to trigger Reequip in Relic menu
C3/9F5C:    20F293      JSR $93F2      ; Define Y...
C3/9F5F:    B92300      LDA $0023,Y    ; Relic 1
C3/9F62:    C5B0        CMP $B0        ; Unchanged?
C3/9F64:    D009        BNE $9F6F      ; Branch if not
C3/9F66:    B92400      LDA $0024,Y    ; Relic 2
C3/9F69:    C5B1        CMP $B1        ; Unchanged?
C3/9F6B:    D002        BNE $9F6F      ; Branch if not
C3/9F6D:    803A        BRA $9FA9      ; Reequip: No

Fork: Compare old and new relics
C3/9F6F:    A5B0        LDA $B0        ; Old relic 1
C3/9F71:    C9D1        CMP #$D1       ; Genji Glove?
C3/9F73:    F037        BEQ $9FAC      ; Trigger if so
C3/9F75:    C9D0        CMP #$D0       ; Gauntlet?
C3/9F77:    F033        BEQ $9FAC      ; Trigger if so
C3/9F79:    C9DA        CMP #$DA       ; Merit Award?
C3/9F7B:    F02F        BEQ $9FAC      ; Trigger if so
C3/9F7D:    A5B1        LDA $B1        ; Old relic 2
C3/9F7F:    C9D1        CMP #$D1       ; Genji Glove?
C3/9F81:    F029        BEQ $9FAC      ; Trigger if so
C3/9F83:    C9D0        CMP #$D0       ; Gauntlet?
C3/9F85:    F025        BEQ $9FAC      ; Trigger if so
C3/9F87:    C9DA        CMP #$DA       ; Merit Award?
C3/9F89:    F021        BEQ $9FAC      ; Trigger if so
C3/9F8B:    B92300      LDA $0023,Y    ; Relic 1
C3/9F8E:    C9D1        CMP #$D1       ; Genji Glove?
C3/9F90:    F01A        BEQ $9FAC      ; Trigger if so
C3/9F92:    C9D0        CMP #$D0       ; Gauntlet?
C3/9F94:    F016        BEQ $9FAC      ; Trigger if so
C3/9F96:    C9DA        CMP #$DA       ; Merit Award?
C3/9F98:    F012        BEQ $9FAC      ; Trigger if so
C3/9F9A:    B92400      LDA $0024,Y    ; Relic 2
C3/9F9D:    C9D1        CMP #$D1       ; Genji Glove?
C3/9F9F:    F00B        BEQ $9FAC      ; Trigger if so
C3/9FA1:    C9D0        CMP #$D0       ; Gauntlet?
C3/9FA3:    F007        BEQ $9FAC      ; Trigger if so
C3/9FA5:    C9DA        CMP #$DA       ; Merit Award?
C3/9FA7:    F003        BEQ $9FAC      ; Trigger if so
C3/9FA9:    6499        STZ $99        ; Reequip: No
C3/9FAB:    60          RTS

Fork: Set to open Equip menu
C3/9FAC:    A901        LDA #$01       ; Reequip: Yes
C3/9FAE:    8599        STA $99        ; Set indicator
C3/9FB0:    60          RTS

The Gau rage bypass could modify a copy of this second code block, making it set event bits (rare item or otherwise) to indicate to the alphabetical rage patch that a different list location should be referenced (effectively loading a different list).
It looks like the code loads data from a character array. In the code itself I see documented relic 1 ($0023 relative to character address) and relic 2 ($0024 relative to character address), but I also found Helmet ($0021) and Armor ($0022). That means you could set it to check an armor type and pick rages accordingly... only problem being that the insertion point I've picked is triggered IN the relic menu... I'd need to see if there's another suitable point to make a check and bypass.