. . .
I'm confident that you will consider this easy when you are done. Have fun and good luck!
Well, how he ends up feeling about it is up to him. I'm equally confident that he will see that a spin-on would have been a cleaner and simpler solution. Have you ever found anything in your GR's element? In four changes, I've seen zip. I too have given up on bothering with the "little cap" but I wonder how long its O-ring will last, given that Toyota presumably designed and spec-ed it with the assumption it would be changed out at every change.
Also consider the irony of oil filters within the GR family. The 4.0L 1GR, found in a variety of the trucks, has the best filter setup I've ever seen. It's a spin-on that sits up neatly on a little tray in the driver's front corner of the engine room, about where a lot of cars have the battery. Assuming it's not overtorqued, you can change it by hand, while wearing a suit and tie. With the room underneath in the trucks, you can do the job with no lift and nothing more than a wrench to undo the plug. Add a Fumoto, and it's a no tool job. In the 2GR Avalon, you must lift the car, and then from the bottom, hassle with the canister and it's O-rings.
I really don't see ANY advantage to a setup that requires that you carefully position O-rings every time you change oil, when by contrast, a spin-on has the sealing ring pre-positioned, and allows you to visually, and by feel, confirm that the seal is intact. You can NOT confirm seal integrity with the canister. That linked thread, above, shows how easy it is to damage the O-ring, with the obvious attendant danger.