I wonder if you hold your stock long enough. If say within a year or two will sell already then no need go through CDP route. Just use any broker custodian account to enjoy the low comm fee. That is how now I strategize. Those SGX stock,ETF I will hold super long time I put inside CDP. Those SGX stock,ETF I within a year or two will sell I use broker custodian account. Only disadvantage is tracking become tedious in 2 places I know.
REIT is long term hold.
You are right that tracking can be tedious if you use too many different platforms.