java – Change the registration level of SLF4J registration messages

We are using an external library, which is registering messages as error messages. These messages cause alerts in our alert system, which should not. As a result, I would like to change the level of these messages at runtime (I do not have access to the source) to a lower level, such as a warning. I thought about using a filter, but I would still like to record those messages, but at a lower level (for example, the error becomes a warning).

I thought about creating a specific appender, but it seems that it is difficult to implement again the creation of registration messages to republish them at a lower registration level.

Someone ideas?