Solubility of oxygen in liquid hydrogen; is anything near 1:2 (molar ratio) possible?
It would be the other way round. 
Since the oxygen is the first to liquify, it would be hydrogen dissolved into liquid oxygen. 

In this article they show the following calculated vapour liquid equilibrium diagram. 



The 2:1 mixture, $x_{\ce{H2}}=0.67$, would exist at around 85 K and 50 bar.