Buddy, long before they started making this sticky oil for these filters, every foam air cleaner used on every lawn mower engine used regular motor oil. I'm pretty sure that it's not going to do any damage to your engine if you use what you have until you get some sticky air filter oil.
I agree, my rig is important to me too take a chance not using AFO. I usually have 2-3 pre oiled filters ready to go when i go out running. This way I can quickly change them out as needed "in the field". Also by having several at the ready, I won't be able to not run due to lack of AFO.