External connection PPOE with VLAN ID

Hello everyone!

Recently I have got a new ISP hooked up to my apartment.

I do have a HP Proliant MicroServer GEN8 with 2x10gbe intel x520 NIC and newest version of ClearOS Community version.

At the moment my config is like this:
1gbps ISP -> ISP ONT -> ISP Router -> ClearOS external
500mbps ISP -> ISP Modem -> ClearOS external
LTE ISP -> RJ45 Modem -> ClearOS external

All is connected to my network with 1 port of the 10gbe intel card set up as internal with all of the gateway functions (dhcp, port forwarding, nat etc.) and multi-wan.

However... I would like to eliminate the use of ISP Router in the first case, so I would like to go -> 1gbps ISP -> ISP ONT -> ClearOS external

The problem is that this provider requires both usage of PPOE AND broadcast of VLAN ID.

I have searched the forums wide and found several posts pertaining to this problem (e.g. solution with creating PPOE external connection and VLAN external, then modifying the conf file for one to use the other) however the solutions provided there did not work for me.

Is there any other way I could do this setup properly without the use of ISP Router for 1gbps connection? I am afraid that ISP router in this case might be a huge limiter when it comes to the amount of packets routed.

Would love some insight, thanks!