This is correct and the height of the remote filter relative to the pump will be an important factor.Adding a remote filter would not change the volume required as long as it did not create any new leak paths. What it would do is add flow resistance which could potentially reduce the oil pressure to the rest of the engine. I'd measure the oil pressure at the end of the line meaning at the last thing to get oiled.
If the pressure is too low you would need a higher pressure pump or shim the relief valve. If the pump does not have enough volume to build pressure to start with then you would also need a higher volume pump. As long as you use a good size line and avoid a bunch of 90 degree bends likely be fine, if you were good before.