Not really, cause loans are likely to be overcolateralized, i.e you need to own more hive than you are wanting to borrow,
Also I don't think you will be able to take out a loan if the withdrawal route is not set to hiveloans as I think that a prerequisite for taking out a loan.
And if you change it after taking the loan out the account gets ceased, the withdrawal route reset to hiveloans and then a 30% fine on top.
So if you borrowed against the full 70% of your HP, 100% of your HP would be used to pay back the loan.
RE: THANK YOU to @coininstant for Being Awesome & Helping get the Hive.Loans Project an Extremely Sexy New URL/TLD! (Plus a Quick Hive Loans Development Status Update)