You seem a little slow in your head. I repeat a last time what everyone knows who is familiar with this. Not only tbills but US treasury bonds can function as well as collateral. To prove this is correct you follow the procedure I outlined my my earlier post. And to see whether eur denominated bonds can be used as well (I have not checked myself) you also follow identical procedure.
Please stop repeating your irrelevant stuff. You don't read carefully, and/or you never took the time to study how IB calculates interest in the account segments. So stop replying if this is something you don't understand. I'm 100% sure IB accepts only cash or T-bills as collateral in the commodities segment, because I talked with them numerous times about it. The margin value of securities, bonds, etc., in the securities segment is irrelevant for my question.
"I am looking for EUR denominated government bonds or any other instruments that can serve as futures collateral in lieu of cash (similar to U.S. T-bills), to avoid having a too high cash drag in the futures segment of the account, as IB pays 0% interest on cash-based futures maintenance margin."