split them into slightly smaller boxes.. maybe 4 or 5.. then post them by surface mail to singapore via the GPO..
takes you around 3 or 4 weeks ? send them to where you going to live next.. c/o your name.. i am sure they have a record of you coming in and accepts your packages
This is a very good suggestion.
And with COVID-19, surface mall could taken even longer, which will reduce the likely holding time OR give you a chance to reduce your two month planned arrival time.