The major problem with looking for loopholes is that authorities generally regard people using them as trying to buck the system. There are occasionally ways to overcome government requirements, but, in fairness, it is not a good idea. Mainly because, if you get caught, they may deport you, if you are not a Colombian citizen, and they could seize your boat.
If you spend most of your time on the hardstand, I assume your boat is not equipped to sail any distance, or that you don't feel confident in sailing offshore. If the boat is seaworthy, perhaps you can enlist the help of a seasoned skipper to move the boat for you. If the boat is not seaworthy, the only option is to try to find an agent in Panama who is willing to help you to secure what seemingly amounts to fraudulent paperwork.
We don't recommend doing anything which is unlawful or unethical. Sadly, it is people who seek to circumvent the law, who make it more difficult for true sailors to get legitimate papers when transiting through , or planning stays in foreign countries.
However, we wish you the best and hope you are able to resolve the problem, and remain at your home base in Colombia. Keep us informed of your progress. Please can you post a photo of the boat just in case there is a skipper who will offer to sail it to Panama for you.
"if at first you don't succeed....Redefine success"!