How to get fiat liquidity on BTC assets

I have 10 BTC (assume current FX $10,000) I want to get $100,000 out

NOT going to happen. Your credit side is too high. OTHERWISE there are now PLENTY of companies giving credit against crypto collateral. But NOT 100% — 50% AT MOST.

Here's the problem, you have a currency that has an ever-fluctuating price that keeps moving up and down with every single small change with the crypto community. Now put yourself in the shoes of the lending company, you have just been given $107,070 in BTC, a currency that in the last week alone has had a peak of 11,080 then has dropped to 10,235 in 3 days. That a 7.63% decrease in 3 DAYS! 10 BTC is a lot of money, but for credit, it's not worth $100,000 AT ALL! I don't even know much about economics and I still know that you will NOT get that sort of result WHAT SO EVER. Items that don't change their value, such as a stablecoin or items that retain their value like a diamond, or certain jewelry work really well for loans, but a currency that is everchanging is too risky to bet on. Seriously.

Good luck with whatever you are trying to do though, and I hope that you can figure out a plan to action! :)