I bought 2 small ferns yesterday, not realising they are hardy ferns for outside. I live in a flat.
The ferns are a Hart's tongue, and a common polypody.
My indoor ferns do well in my shaded east exposure kitchen.
The ferns will have no knowledge as to whether they're indoors or outdoors. All that matters to them is that their growing conditions are ideal. If you can find them a spot indoors that offers partial shade, and you ensure that they're in moist but well-drained soli, I can't see why they shouldn't flourish.