Well, as my Pops used to say, "You can want in one hand and sh*t in the other and see which one fills up first."
That's car ownership. You can fix it, donate it, or you can cut your losses. Being in a hurry AND wanting more than it's worth is working against you. BTW, the tax writeoff value will be KBB for a running car, so I'm not sure why that's not an option.
I've been buying and selling cars for 35 years, and sometimes you don't get back what you put into them. $500 is all it's worth in non-running salvage value, even if you put $5k into parts.
Sorry we couldn't help.