The main problem is that you are a completely new account asking for a loan. 10-20% per year might be reasonable for a trusted member IF it really were for a year, but you want to extrapolate that interest to a few days? If we consider fees and all that you are basically asking for a free loan. And then there is the collateral that might not account for extreme valuation changes of BSV.
What do you want the BSV for if it is not too much to ask? I mean, if you already have 110% the amount in BTC... Can't you just leverage your BTC or convert it and do "your thing" then convert back?
Anyway, eddie13 offer above seems to be very reasonable and maybe closer to what you are looking for.
Yes, I am a new person here, no doubt. I fully understand that you are afraid. To be honest I am not willing to send any BTC to anyone if there is no third-party escrow service or any other guarantee. But if I offer a collateral there is probably no risk for a lender, right? OK, if there is a price change I can increase the collateral.
Since I am not an English native speaker I have difficulties in uderstanding eddie13's offer. But I don't think it is an offer from a BSV holder - he writes "exchange rates both ways"...
I can borrow 100 BSV for a year returning 110-120 BSV. That's even better for me. The question is wether it is better for you because the price within a year can be very low and your 120 BSV will be depreciated. I thought my offer might be interesting for someone who holds BSV and can lend them for a while earning a little extra profit instead of holding them on a wallet and earning zero.
What is "my thing"? Sorry but I am not going to reveal it. But it is better to use BSV (mine plus borrowed) and return the loan paying the fee (reasonable) than converting my BTC to BSV and back. If I use the conversion I face the price changing risk, but if I use BSV there is no risk on my side.
Once again, I am looking for people who own some BSV and within a week/month/year are not going to use (sell) them.