I believe in the terms of your 2Gbps contract, it is stated that ONR is provided, and they will not provide / entertain bridging, at least that is the case for my 5Gbps plan.
You can try, but i would not bother, as the installer most probably will not even know what you are asking. When i asked mine (very nicely), he asked "What is bridging? Please call 1688."
His job practically is:
Connect the ONR
Connect the SingTel supplied router, if any to the ONR.
Run Speedtest on the router web interface and show you the result.
He will not even touch your own equipment like any third party router and he clearly told me so.
For mine, he helped me connect the UTP cables to my devices, but told me clearly if there are any issues, to call 1688, as his job is merely to install the ONR and SingTel router.
He was nice enough to show me how to connect to the WiFi SID with the password
For me and Xiaofan, we took the risk and did the bridging ourselves.
I have Singtel technicians coming tmr as am upgrading my currently 1 gbps plan to 2 gbps plan. But it will replace the my current old ZTR ONT with the new ONR. I plan to get a dedicated 3rd party router in future. Should I try my luck to get them to set up the new ONR as ONT as am seeing alot of people saying about double NAT trouble.