link aggregation do not equal to 2. It more than redundancy in my opinion if my memory do not lapsed.
It doesn't equal to exactly 2 Gb/s due to inefficiencies and overhead, but one of the functions of 802.3ad link aggregation is increasing the throughput of the device to device link. Another function is redundancy, yes. Both cables are treated as a single connection, according to the Asus marketing material on their implementation of it. So happily, I can report that it is an option for the OP to keep his AX11000 and get a wired ~2Gb/s connection through link aggregation. Here is an Asus FAQ talking about it: https://www.asus.com/support/FAQ/1016088/.
Make sure the switch you buy supports it. I don't know if that means it would have to be a managed switch.