I am probably wrong but here goes
I used to shoot Ha narrowband on my SBIG 2000 XCM which is an OSC. The results were great, heaps of detail under light polluted skies.
I don't see why you you wouldn't get equivalent results with SII and O3, subject to the object having some.
You would probably have to extract one channel from each of the filtered images Ha, SII, O3 as the camera is an OSC but could then combine as a narrowband image?
My confusion arises because of the following. On a mono camera there are no channels to extract, you are supplying the 3 channels from 3 separate filters. If you put a filter on a OSC and extract channels then essentially you are saying Ha is Red, O3 is green and SII is blue. So when you combine what do you get, an RGB image or some sort of Hubble Palette image?
So I am not sure you can get narrowband looking images using the filters or just the equivalent of an RGB image.
So, if you want RGB under light polluted skies then maybe but not sure about getting the colours you see in actual narrowband images.
Sorry about the long winded waffle answer with many questions...