Yes, and if you wait 4 months you also won't have your desired target portfolio allocations, because your global stocks percentage will be 0% for the next 4 months.
You're suffering from paralysis by analysis right now. Look, you're not going to retire on S$1,600 of total wealth decades from now. It's absolutely not a problem to be either (or both) slightly or temporarily outside your target portfolio allocation. Get going now, then, a year from now, rebalance, and don't bend yourself into a pretzel to do it. If your portfolio is 2.2 percentage points "too bond heavy" on a random Tuesday, it's really not a problem. "Gentle nudges" to steer the percentages back toward your target, once or twice a year, is more than sufficient.