I get you, bro. But like you said you are canoeing so you have the boat carry the weight for you, same as me when I take a car, build a tent and then walk around the area having a base to return to and a car if something bad happens. When I did these wilderness hikes I just used a tarp and dug a moat to shelter myself from a potential rain if there was no shelter anywhere, which there usually is honestly. Also, weather forecast is important, you don't want to go out to some completely deserted part of Europe during the rainy season.
I could literally talk about this for hours as wilderness survival is one of my hobbies but suffice to say, best is to stick to trails between cities so you can start and end each day around other people, there are a ton of reasons for it (security, health care, food/water, comfort etc. etc.). There are plenty of trails which are for the vast majority of the time completely devoid of any semblance of modern world, only every once in a while you come across a sign saying "*backwater* 2-10 miles". Those are honestly the best options for someone going alone.
I would never go to the depths of wilderness in Europe or any other continent alone, like not in a million years, and OP is talking about a potential trip from Germany to Japan, someone who has obviously no experiences with any serious hiking if he is asking us about a tent. I could talk for hours why it is a dumb idea. For something like that you would need so many things and a ton of know-how and experience to even attempt something like that, not to mention you have to know the locals of countries like Russia or Iran since you are going to the far east and those areas are almost certain deathtraps once you leave the big cities. Not to mention your body has to adapt to this kind of abuse, if you just suddenly decided to up and leave for a 1000+ mile hike your body would shut down after a few days 100%, I saw it many times already, it happened to me too the first time I was putting on airs thinking I could do anything.
Like I said, everything about the OPs post reeks of lack of basic knowledge and I hope he doesn't try anything stupid. He should go take a walk along the entirety of the Alpenstrasse and take it from there. If he can do that then he has my respect as an intermediate hiker. BTW. Alpenstrasse is legendary if you take a powerful bike and you get good weather, absolute dream.