Building several dynamic libraries with one shared GC

[NonNull]

I am making a plug-in development system for a high performance 
Linux application that already exists and is written in C and 
will not be modified for this purpose. It is already has an API 
for plugins written in C. A plug-in simply makes new functions 
(e.g. manipulating text and numbers) available to be used inside 
the application. The D GC will intentionally be available inside 
a plugin.

I have written a D source file containing templates that do the 
work when a plugin is written by a third party in D. A plugin 
will expose a C API for the functions made available to the 
application, and any data in D made available to the application 
will be copied to the application's managed storage and vice 
versa, so there are no GC issues.

All of this is to make it as simple as possible for a third party 
to write such a plugin without worrying about any of these 
issues, and use D in a simplistic scripting language-like way. 
This is for non-experts. They just use the templates and build a 
dynamic library and all of the above is done for them.

If several plugins are built by different third parties, each 
dynamic library will have its own GC and copy of druntime right 
now. How can I organize that there is one separate dynamic 
library to share these among all plugins?