I've done it with Odin 1x, 17mm, 320(30) thermal on right eye and PVS-14 on left eye and answer for me is that I can use the thermal and the 14 together and aim with the laser. That being said, depending on conditions and balance of the brightness of the two devices and which eye is naturally dominant, I'm not often AWARE of seeing through both devices at the same time, even though I am. My brain can "emphasize" one device over the other without having to close one eye. But sometimes to force one device to be prominent, I do close one eye.
So a thermal can spot a critter in the brush but to aim accurately with the laser you still need to be able to see the critter with the laser, otherwise there will likely be an offset ... and for me that offset changes with my head position and the distance, so it doesn't seem to be predictable, so you can't rely on it. You need to see the critter with the pvs-14 eye to aim with the laser. And if the critter is in a brush or deep in woods or in a real dark place that might be tough, even though the thermal can see it fine. The only solution I've thought of to help in those cases is to have a powerful ir-illuminator with a one button activation, that activates both the laser and the illuminator at the same time. Then you maximize your chance of being able to see the critter with the pvs-14 and aim quickly with the laser. But I don't have the one button now. For rat slaying, when I was using the laser, I just left the illuminator on my helmet on. There were a couple of times were all I could see were the eyeballs, but that was enough to take a shot. I had seen the rat with the thermal, I then looked with the 14 and due to the illuminator being on could see the eyeballs and take the shot.
So it is close, but not perfect to what you are asking about. It is not true fusion, it is a "poor mans" sort of fusion. If you want a type of true fusion, then the PAS-29/COTI with a PVS-14 can get you there, but those are pretty short ranged. Good enough for hogs. At 50yds they are great .. at 300yds not so great. If you already have a PVS-14 then the COTI would run about $6,500 plus or minus.
Or you can shoot for the moon and go for the PSQ-20
They run $14,000 street price ...
So poor man's works for me ...
Middle income man solution (COTI) has distance limitations on the thermal side ... doesn't work for me.
Rich man PSQ-20 has pocket book emptying syndrome ... so doesn't work for me.
pick your poison!!!