Have you seen the jazzy carbon? It’s a small foldable electric chair. 40 pounds and can fold in a taxi trunk and fit in an airplane overhead bin. It’s expensive ($3k) but some associations or even PALS could lend it to you if you didn’t want to invest. My PALS is in a similar position to you mobility wise and has been using this a lot and it’s been great. He uses his cane for short distances but took this to my sons track race, a water park, etc. it can go over bumps and hills which is needed in Europe. make sure whatever you take can fit in a taxi trunk, as you will need to take the device places not walking distance. One other suggestion for Europe is to rent a device there. We rented a large electric scooter in March in both Denmark and Munich through Motion4Rent. They dropped off and picked up at hotel. The scooter was great for cobblestones and hills but it was too big to put in a taxi which meant if we went somewhere far we couldn’t take it with us. I wish we would have rented that AND something portable. Good luck and have a great trip!