The rules of the SSIA scheme prohibit a lender from lending against an SSIA (e.g. taking the SSIA as security against the loan).
However, from a bank's point of view you have demonstrated the ability to save on a regular basis, and I would suspect would be more than willing to look at your loan application in isolation from your SSIA. Monthly repayments would have to be made on the loan (you couldn't opt for a bullet payment from SSIA maturity proceeds).
When your SSIA matures you can decide how to use it, and if you decide to clear your loan at that stage, then you are perfectly entitled to do so (if you are considering this route, as it seems you are, then don't opt for a fixed rate loan).
Hope that's of some help.
Best of luck.
BM