What you should be doing is focusing on getting more magazines right now, and just assume the gun will come eventually.
I would call Kel-Tec every morning shortly after they open and eventually they will have PMR-30 Magazines in stock. Then order as many as you can/wan't for the 2 guns.
If you don't get the second gun by July 1st keep trying. The gun is entirely legal to sell in Colorado as long as you don't include magazines, so they will either still be selling them, or if they aren't, you can purchase one from someone in another state and have them ship it to your FFL without the magazines. Besides, the law is so poorly written it may be overturned soon enough anyway.