@Bob Romano, I see how you and your agents are confused.
Firstly, hard money and even Private money are not cash, other members that have mentioned that are right. It is financing, just on different terms.
So you should write it as a financing deal, but exclude mortgage contingency from the contract, that tells the buyer that you are confident on getting funds in 10 days.
Secondly, your agent should not dictate you on what earnest deposit has to be, this is totally up to you to constitute the offer terms - agents duty is to submit it to the Listing agent for sellers acceptance / counter or decline.
If your agent is not comfortable working that way, he knows where the door is.
Now if he is TELLING you what the EMD has to be. If you don't have an exclusive right to buy contract signed with that agent, just let him go, he does not act in your best interest and therefore does not fulfill his fiduciary responsibility. IF you DO have the exclusive right to buy contract in place, speak with your attorney or a broker directly to see if you can get out of it based on breach of fiduciary duty.
Trust me , there are plenty of realtors out there that would want to do business with you the right way!