If your freight forwarder can’t do this, it’s time to find another one. The only way I see this being an issue is if you used Amazon logistics and the end destination for the entire container is Amazon. Otherwise this container is likely going to be opened and cross docked in a warehouse after it clears customs. It should be easy enough for them to send your goods to another warehouse that will do the repacking services that you require if the original cross dock warehouse doesn’t offer those services. I’ve had to do things like this many times in the past. It’s not cheap, but cheaper than being suspended from FBA permanently.
No one can really say what the punishment will be, but as others have said, they don’t take this lightly. I would push the issue with your freight forwarder. They might not like the extra work of doing this but so be it.
At the very least you should be able to reroute your shipment to another location. What I suggest is looking for an organization that works with disabled people somewhere near your intended delivery location. In the smaller city where I live we have 3-4 organizations that do things like this. I like using them because their workers enjoy doing different kinds of work for a little variety. It helps those folks become productive members of society and gives them a job that they might not otherwise have. It might take them a little longer to complete a job but that is an acceptable trade off for me. Get what I need done and help out some folks that could use it? Absolutely.
Good Luck,
TJB