I'd take that money and the money raised from selling a few more guns, sell the castle and move to the US - go south or even west to Alaska - after a short time, you can start buying guns again in most locations....from a friend in a parking lot with cash and no ID's even.
Many say "we can't move" but most are not really in that position, just not motivated to do so. Certainly there are unique situations like medical care for a loved one, etc but in most cases people should just move. Can you imagine what would occur if a large percentage of the areas revenue just up and moved away? California, Washington and Oregon will be in the same position in the near future to make this decision.
If I were staying, I'd drop that coin on a cannon for the front yard so I'd be properly armed when it's time to dump the tea into the harbor.