Depending on the use case you may be able to do something like ECMP. An example use case is here: https://blog.muthuraj.in/2020/06/high-throughput-site-to-sit...

I haven't but I have almost tried Zerotier multipath: https://docs.zerotier.com/zerotier/multipath/

If I understand correctly, it should do something what speedify does.