You might want to look towards something like a “Rhodes-car” a 4 wheel “bike”
Two options:
Get a cheap bike with a good bag. The bike is going to get stolen. Don’t think twice about abandoning your bike. No one needs to die because they hesitated because of a damned bicycle.
Or get a really good bike. Beat it up and paint it to look like garbage. Then apply the first rule up there. You’ve got to have something that is worthless.
If you have a bike, you’re a target to someone who has no bike. If you have a bag, you’re a target to someone who has no bag. Ergo, you need to move stealthy and keep it away from people.
You may have trails where your bike is useful, but you’re moving so fast that you’re missing the guy up in the tree in the gilly suit who is ready to put an arrow in your head over a damned bike. Slow travel is important for this. You need to be fully aware of stuff around you.
And keeping to roads, regardless of how quiet that road is is also futile. The only way a bike is useful for this sort of thing is under the cover of complete darkness. And you better where pads and a helmet because I’m talking DARK.