Looking for PCM options

Last week I picked up a 5.7 Hemi/8HP70 drop out of a 2015 Dodge Charger. Supposed to have 60k miles on the engine/trans. I don't currently have a project car ready to drop this stuff into, but I would like to get it started/running on a stand.

I got the wiring harness with the engine, but no PCM. Looks like I can pick up a PCM from the wrecking yard for around $100, but I am not sure that will get me anywhere.

What is my best option to get a engine controller I can use to get this thing fired up?

I looked at hotwireauto, $550 for a user computer, sublimeparts, has an unlocked PCM for $450 (when available) or will unlock my computer for $300. Although I have emailed them multiple times and have gotten no response.

Or do I just break down and buy a Mopar crate kit for $1500. I cannot seem to find just the Mopar Crate PCM for sale without the rest of the kit.

I kind of want to try my hand at making the factory wiring run the engine, but I need a PCM to do this.

Any Suggestions?

Thanks