Presuming you are not stopping in Singapore
You won't be able to rely on the winds this time of year so I'd make sure you had diesel
enough to motor
for about 10+ hours. The good news is any wind
you get will be Southwest and the trip will be a close reach/close hauled until you hit Raffles light and turn northerly.
You'd best hug the right side of the fairway, lots af very fast ships will be passing you, give them room.
In terms of tide there isn't a great story. At some point you will be against current
comes into Singapore from both ends of the strait. I've passed close to Raffles light with 3+ knots against me. My advice is don't pass too close to the light, it gets really choppy and confused.
I'd go at the middle of the flood and you should have a tail current
for the first part, hopefully pass Raffles by the time the next ebb is getting underway. Then when you make the turn into the west channel you are at slack or still fighting the last few hours of the ebb.
Most sailors here do this several times a year (Changi to Raffles marina) - I have done it in 8 hours and I have done it in 12 hours. Most sailors go when they "have" to - i.e. start early Saturday morning because that's my day off - and take what they get.
Other Singapore sailors may weigh in here. Like I said my "average" is like 10 hours but your idea to go with a low variation in high to low is probably as good a strategy as any. Whatever currents you do get will be minimized.