Could get rid of the fillport altogether?
1st option : Make the top res inlet a rotary connection and just unscrew it to top up. Id advise you fit a downtube inside the res from the top inlet - itll make it easier to bleed and you wont get the vortex effect. Initial fill could be tricky though.
2nd option : Fit a delrin Tee piece in the tube from the top rad to the res inlet. Have the flow go straight through, but on the Tee branch fit a koolance QDC. You can then clip on the filltube when you need it. Combine this with the rotary above to make top ups easier.
Just a quick pointer - make sure you fill the loop with the case on its back, top mounted barb down rads are a nightmare to bleed and this makes it much easier. I've a similar layout to you in my case albeit with more rads, and it took me a while to get the filling technique down. Here's the relevant post anyway. The section of tubing I disconnect to fill would be between top rad and top res for you, i've got an extra rad in between. You can skip the bit about the rear rad too as its not relevant for your loop. Speedy finger work is needed to reconnect the tube, you will spill a little water so make sure youve got paper towels all around the connection. It gets easier with practice. A Tee connection here as per Option 2 above would make this far easier. Once you have it connected again tilt the case towards its roof so that any air that got in when you reconnected the tubing goes into the res (thats where the downtube mentioned in option 1 comes in as it allows the water level to be low and not allow air into the top rad even with a top inlet). This will leave you with a pretty much completely bled loop before you even turn the pump on.
Hope some of that at least is helpful.
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