May I ask you to share your experience and advise about how to borrow ETH to buy BTC, please?
If you want to borrow ETH and want to convert it into BTC why not just go borrow directly?
I'm interested in taking adventage of price action so could be settled off-chain.
But before borrowing, this is like an arbitrage that you want to do. I don't think that someone will be easy on you and will just allow you to borrow money. Just a tip, I've seen people that have borrowed money to invest in crypto and then they've ended up with a bad fate.
Or you can explain more about your plans but still, I doubt it that there's a platform that you'll be ever allowed to borrow without a guaranteed collateral even if you put this plan on their table.