Hello and Welcome to the Wefugees Community!
Our platform and experts are based in Germany. Therefore, I’m afraid that we can not share much experience about Belgian immigration rules and procedures. I’m also not familiar with the visa you are interested in. I assume it would be the best to contact the Belgian embassy in Germany directly to ask for the respective requirements.
However, please be aware that your asylum case would be cancelled as soon as you leave Germany.
In any case, don’t hesitate to get back to us with any further questions - especially if they concern rules, procedures or life in Germany :-)
All the best,
Meike