TexasCHLforum.com

I've been out of IT for several years and I'm rusty, but maybe somebody else here can pitch in with better info.
There is a thing called "Virtual Static IP." The one I used years ago was a for profit service. A quick google search found a site that charges a little more than $8.00/month. There may be better alternatives. Basically, you install a piece of software on a server on your network that continually sends an updated IP to the service. The service gives you a static IP on their site that redirects traffic to whatever your present IP is.
Again, it's been years and I'm rusty, but maybe you can find a white knight with a static IP who would be willing to host a similar service. Find a Good tech. Check with whoever runs the NRA website. That should be a knowledgeable individual. I'd be glad to help but again, it's been a while.
Let me know if you can't find a good tech, and I'll see what I can find out. I maybe can call in some old favors from some friends in the business.