I recently bought FSUIPC7. Barely scratching the surface so far but I'm impressed with the capabilities.
Just saw this on the Working Title Discord, thought it may be helpful:
https://github.com/Working-Title-MSFS-Mods/fspackages/wiki/Sim-Variables
Sim Variables
This list is always subject to change
Since our AP runs independent from the sim AP you can no longer use the default K Events to trigger AP modes.
For the AP variables like HDG, Alt preselect, VS you must use the K events with indexes. These should usually go to index '1'
AP Mode triggers
The triggers for AP modes are H Events which stock SimConnect has no access to. External apps seem to be adding modules which would support LVars and HEvents. So ask the developer of your external binding application to add this feature.
HDG - H:WT_CJ4_AP_HDG_PRESSED
LNAV - H:WT_CJ4_AP_NAV_PRESSED
APPR - H:WT_CJ4_AP_APPR_PRESSED
VNAV - H:WT_CJ4_AP_VNAV_PRESSED
VS - H:WT_CJ4_AP_VS_PRESSED
FLC - H:WT_CJ4_AP_FLC_PRESSED
AP Mode indicators
The indication for active AP modes is run via LVars (read-only)
HDG - L:WT_CJ4_HDG_ON
LNAV - L:WT_CJ4_NAV_ON
APPR - n/a
VNAV - L:WT_CJ4_VNAV_ON
VS - L:WT_CJ4_VS_ON
FLC - L:WT_CJ4_FLC_ON
Upper panel (above PFD)
H:Generic_Upr_Push_NAV
H:Generic_Upr_Push_PFD_MENU
H:Generic_Upr_RANGE_INC (Map Zoom)
H:Generic_Upr_RANGE_DEC (Map Zoom)
Lower panel (below MFD)
H:Generic_Lwr_Push_MEM1_1
H:Generic_Lwr_Push_MEM2_1
H:Generic_Lwr_Push_MEM3_1
H:Generic_Lwr_Push_CKLST_1
H:Generic_Lwr_Push_PASSBRIEF_1
FMC Buttons
H:CJ4_FMC_1_BTN_IDX
H:CJ4_FMC_1_BTN_MSG
H:CJ4_FMC_1_BTN_DIR
H:CJ4_FMC_1_BTN_TUN
H:CJ4_FMC_1_BTN_FPLN
H:CJ4_FMC_1_BTN_LEGS
H:CJ4_FMC_1_BTN_DEPARR
H:CJ4_FMC_1_BTN_PERF
H:CJ4_FMC_1_BTN_DSPL_MENU
H:CJ4_FMC_1_BTN_MFD_ADV
H:CJ4_FMC_1_BTN_MFD_DATA
H:CJ4_FMC_1_BTN_PREVPAGE
H:CJ4_FMC_1_BTN_NEXTPAGE
H:CJ4_FMC_1_BTN_EXEC
H:CJ4_FMC_1_BTN_CLR
H:CJ4_FMC_1_BTN_CLR_Long
H:CJ4_FMC_1_BTN_L1
H:CJ4_FMC_1_BTN_L2
H:CJ4_FMC_1_BTN_L3
H:CJ4_FMC_1_BTN_L4
H:CJ4_FMC_1_BTN_L5
H:CJ4_FMC_1_BTN_L6
H:CJ4_FMC_1_BTN_R1
H:CJ4_FMC_1_BTN_R2
H:CJ4_FMC_1_BTN_R3
H:CJ4_FMC_1_BTN_R4
H:CJ4_FMC_1_BTN_R5
H:CJ4_FMC_1_BTN_R6
H:CJ4_FMC_1_BTN_A
H:CJ4_FMC_1_BTN_B
H:CJ4_FMC_1_BTN_C
H:CJ4_FMC_1_BTN_D
H:CJ4_FMC_1_BTN_E
H:CJ4_FMC_1_BTN_F
H:CJ4_FMC_1_BTN_G
H:CJ4_FMC_1_BTN_H
H:CJ4_FMC_1_BTN_I
H:CJ4_FMC_1_BTN_J
H:CJ4_FMC_1_BTN_K
H:CJ4_FMC_1_BTN_L
H:CJ4_FMC_1_BTN_M
H:CJ4_FMC_1_BTN_N
H:CJ4_FMC_1_BTN_O
H:CJ4_FMC_1_BTN_P
H:CJ4_FMC_1_BTN_Q
H:CJ4_FMC_1_BTN_R
H:CJ4_FMC_1_BTN_S
H:CJ4_FMC_1_BTN_T
H:CJ4_FMC_1_BTN_U
H:CJ4_FMC_1_BTN_V
H:CJ4_FMC_1_BTN_W
H:CJ4_FMC_1_BTN_X
H:CJ4_FMC_1_BTN_Y
H:CJ4_FMC_1_BTN_Z
H:CJ4_FMC_1_BTN_0
H:CJ4_FMC_1_BTN_1
H:CJ4_FMC_1_BTN_2
H:CJ4_FMC_1_BTN_3
H:CJ4_FMC_1_BTN_4
H:CJ4_FMC_1_BTN_5
H:CJ4_FMC_1_BTN_6
H:CJ4_FMC_1_BTN_7
H:CJ4_FMC_1_BTN_8
H:CJ4_FMC_1_BTN_9
H:CJ4_FMC_1_BTN_DOT
H:CJ4_FMC_1_BTN_PLUSMINUS
H:CJ4_FMC_1_BTN_DIV