In this case it is the tried and tested method specified in the dslreports link.
Buy a BCM57810S based card - other SFP/SFP+ cards will not sync a HSGMII module.
Get a SFP HSGMII compatible ONT module. Popular one right now is GPON-ONU-34-20BI from FS.com. You need to know how to reset the...
The first one is an XPON ONU stick. You can use this if you have an XPON offer from your ISP. Seeing how you're talking about 2.5G, you could be on GPON, so you would need a GPON ONU. My recommendation is to stay away from aliexpress for these sticks and get a proper programmable one from FS.com...
The only NIC I know of that can do this are Broadcom BCM57810S based cards.
You will need to use Broadcom's ediag tool to force the port to recognise HSGMII SFP modules, followed by kernel patching whatever firewall solution you decide to use.
Have a read here, I used to run an implementation...
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