I have a IB account in EUR denomination with a cash balance of 30K EUR plus 15K USD, which I use for day trading. I would like to sell EFP or buy T-bills for the entire cash balance to accrue interest while still retaining margin for daytrading. How do I hedge the currency risk involved in selling EFP or buying T-bills? From this respect, is there any difference in going the EFP or the T-bill way? Thank you.