Release software as GPL (or similar) but allow non

I am trying to figure this out since a few days now and find no way to do this:
I have a software I want to release under the AGPL so the base system "is open-source", but my software has a plugin interface, where external plugins can be loaded at runtime (so no separation which the GPL would allow).
I now what to make it possible to others to develop non-GPL plugins, as I do not like "this part" of the GPL.

Is there a ways to somehow allow this as an exception to the GPL or in any other way?
Or is there a license which has the same copyleft for the code itself but permits linked software to be under a different license?

I already though of releasing the plugin interface under a different license (like LGPL), but to quote a well know CEO: "The GPL is like cancer". This is not possible, as the plugin interface must be GPL, because it is also linked into the (A)GPL'ed main project.

Could I solve this with some kind of "weird" dual-licensing of the plugin interface?

PS: My software is developed using .net 4.5 and C# if that matters anyhow.

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您可能希望将API库/程序集发布为LGPL，它允许用户链接它们而不会“污染”他们的软件，因此这些插件没有污点，但仍需要增强API库的发布。

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