alt Hacker NewsThere is no clear evidence that the risk of "a practical post quantum computer would arrive in the next 5 years" is greater than "post quantum scheme X is broken" for any scheme X. The only way to go is hybridation and it is quite hard from an engineering point apparently.
There is evidence of the opposite: graph singular isogeny mumbo jumbo algorithm was proven to be easily broken on an ordinary computer.
Hybrid encryption is as simple as running one encryption and then the other. Problem is mostly that post quantum keys are large.