try to do that by 5th (tomorrow)......for dividend calculation purposes

monthly dividend cutoff

https://www.ptptn.gov.my/KalkulatorDividen/Utama

you are right, can be done, change statement date, forego  promotion FCFS timing...
but you may miss out quite alot of those FCFS promotional campaign cashbacks

but card feature CB alone,can be quite alot also, depends on  how many.
off hand i can recall
Amb true RM1000 x7 = CB210
RHB 2500 x3 =150
PBBi 750 x3 =90
MQ 600 x3 =90
VS 634 x3 =114
Affin 3080 x3 =240
SCB Smart 1000 x4 =60
LP 10000x4 =200
JOP 2500 x4 =240
Alliance You 3000 =42
VS 3000= 55.50
Barcelona RM5000 x2 =100
Yolo 600 x2 =60
cimbecard 2000 x3 =150(60k points)

some need add swipe category to max out,
BT benefits from RHB, Affin, PBi, UOB, Aeon. show u Aeon.

3 accounts? some control their spouses and kids accounts.