Believe it or not, the employer offering a loan is a pretty standard way of tackling things. But it should ALWAYS be interest free. Often it is done as an interim payment half way through the first month of approx 2 weeks pay, then potentially a second payment of a weeks pay, 2 weeks into the second month.
This should be payable back at a rate agreeable to the employees. I have heard of cases where the loans are paid back over 3 or 4 years at rates as low as �5 a month. So that should not cause hardship.
I would sit down and work out how much you think you need to bridge you over during the first month or two, and then how much you think it is reasonable to pay back each month without causing hardship. Then make the company a proposition. The lower the payment, the less difficult it will be, but the longer it takes to get all settled. Its getting a happy medium.