[rfranzq]

The good news is you have come to the right place. And it would appear that you can afford a comprehensive solution. But I am not the one able to give advice as to specifics but a general observation. You need to have a 'universal' UNLOCKED wireless dongle that can do all the bands in Europe. With that you can probably find a SIM that will work in many/most places and then a few country SIMs to handle the exceptions. I suspect that there might not be viable solutions for some contries, and you just might have to do McDonalds or nothing in them.

Do you have the hardware yet? What is your estimated budget? How long will you be traveling? What is the wierdest places you will be going?

These questions might help others to focus on what can be done.

Good luck!!