[pabs3]

Just add an AGPL command-line interface, or a daemon wrapping the library and you have a process boundary. That doesn't necessarily create a derivative work boundary, but it probably would if it is generic enough to be useful to everyone.

[gettalong]

Yes, creating a binary and calling that would circumvent the AGPL. But then everything will be more complex and slower.

Also, doing this extra work and developing the binary is probably more expensive than just buying a commercial license.