Yes, you have a couple of options. You can remote build from your PC through the Mac or you could move the project to a Mac. However, moving your project to a Mac will require the project be converted to a C++ project in order for XCode to compile both the plugin and the project simultaneously.
I believe you can do this by simply adding an Blank C++ actor to your current project. Then move the (now C++) project to a Mac, click on the .uproject to generate XCode files, compile and from there, deploy to iOS, plugin and all.
*The “I believe” part is about simply adding a C++ element. I know this can be done from a project started as C++ from the outset.