Rental is probably your best bet, but it won't be cheap by any stretch. Also, you would need to make sure you can actually cross the EU-Morocco border on a rented bike - both that Morocco will let you in, and that the rental company will allow you out, and that's not a given.
There is also the fact that Amsterdam to the ferry is ~2500-2700 km each way, Google maps says 25-27 hours drive time, and that means something like three days of non-stop riding and seeing absolutely nothing on the way except gas stations and roadside motels. So that's half of your two weeks right there, spent completely uselessly.
Tbh if you already have your tickets to Amsterdam, then my best recommendation would be to connect on a cheap flight to Morocco directly and rent there. You can easily fill two weeks in Morocco alone. Maybe leave a day or two to see Amsterdam itself.
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