I appreciate that it is really hard to get work experience especially shadowing a doctor or medical teams. Esp if you are young.
It's also really generous of somebody in Germany to offer to help.
I agree with the above poster, keep plugging away in UK. Get a public facing role, cafe or similar, volunteer in a care home. Do BSMS online and observe GP and reflect hard on what you see. And keep trying for formal work experience/shadowing.
With regards to the Germany offer, several unis won't accept it as evidence of work experience. Some specifically say experience overseas won't be considered. So bear that in mind and don't spend a fortune on medical tourism.
However, work experience is an odd one because med schools seem to want/ need evidence of it. But what they really want is evidence that you have looked into medicine and are absolutely sure that it is what you want to do. So it may not qualify on the tix box front, but it might help you be sure in your own mind. And reflection is always good.