WAN aggregation on ax-11000

[yellowdog22]

Hi there, I've recently had 2.5gpbs FTTH installed and I want to try and maximise the wifi on my ax-11000 without going into any serious modification or extra purchases. My Asus AX-11000 has WAN Aggreg. but I'm pretty sure the ISP modem doesn't support LACP-IEEE 802.3ad. But I was thinking that I could try putting a small switch something like the Netgear GS808E in between the ISP router and Asus and activate link aggregation on the switch. Does anyone think that would work or am I getting this completely wrong? Cheers!