thanks for the link. This would indeed be a possibility to use microstream in OSGi.
However, I think the simpler approach would be to add the above mentioned header to your manifest. At least for all my test this worked perfectly.
All I did was to repackage your "all" artifact and generate the manifest via maven-bundle-plugin.
Don't know if this helps you, but here is the needed maven plugin configuration for this:
The module's packaging would need to be "bundle" instead of jar, but there's virtually no difference between those two aside from the additional information in the manifest.