Hi Emil,
As per our previous updates, it is not possible to separate shimmer from the core package. However, while referring core project in the application with linker and if you use only shimmer in it, the package size will not increase more than 0.3 ~.0.5 mb. We have optimized it to the maximum possibilities.
Please let us know if you have any queries in this.
Regards,
Divya Venkatesan