Any transaction which involves using pre-IPO shares will need to be carefully constructed. For example, there are usually covenants and policies that will dictate what you are allowed to do with your equity.
In particular, there may be restrictions on shares being transferred (as will need to be the case if they are used as security). If there is a margin call or you can’t keep up with payments and defaults on the loan, the lender can move to sell or take over ownership of the position, effectively triggering a permanent transfer of shares. Share transfers can be a real challenge for this type of stock - especially if that were to happen before the company goes public. All these elements - and more - will need to be considered before Enness can even approach lenders for you.