Interface/Bonding with different speed ports

Hello, we need to implement something like Interface/Bonding but different ports speeds, ir is possible ?
In our scenario we have two sites and the sites are linked with two wireless links with different BW (one is running in 5.8Ghz and the other in 3.65Ghz), we want to implement a single ethernet channel “like” with both links.

I readed about Interface/Bonding in mkt, but I think this implementation assumes that each port involved in the bonding has the same speed, for example 100mbps.

Our network is ip routed, I have no problem to see the “aggregated link” at ip level instead ethernet.

Any tip for this ?

Best regards,
Jack.-

I’m thinking in a random mangle rule mark and routing mark to choose from multiples default gateways, I think this should work well but no failure control if a link get down…