You usually can in the form of a letter of credit. However, if you take a look at a letter of credit vs. a
surety bond, you will realize both options have a cost, and the bond is usually cheaper.
A letter of credit (ILOC) typically requires a 1% annual fee, $250 in this case. The letter of credit also freezes up the $50K, that you would otherwise have as liquid cash. Currently, Capital One money market accounts are offering 5% interest. This means, the true cost of the ILOC is 6% or $1,500 annually.
Your best bet is to pay the $500 bond premium, and invest the $50K. The interest earned on the investment will pay for the bond 2.5 times over.
Let me know if you have any further questions.