Forgive me if someone answered already but I saw you asked about adjusting the SME.
Adjusting the SME 3009 is easy. You slide a weight to set the tracking weight, and move a bit of fishing line to adjust anti skate. You should get a scale anyway, and you can use it to set the weight when you change cartridges. For anti skate just set up the arm for one cartridge and note the position of the cord, then the other. Then just alternate it beteen these positions. If you have reasonable manual dexterity the swap should take a minute or so once all settings are known. The manual for the 3009 is easy to find online.
One complication with the 3009 is rather than having slotted holes in the headshell, the whole arm base slides back and forth. I would slide it such that it's set up correctly with the ortofon, and then for the second cartridge use a headshell with slotted holes for alignment, so that you don't need to constantly be moving the arm base around.
Now all this said, what do I think is the most elegant solution to your problem, in general?
Well, since the system sounds great with movies, we can eliminate changing anything downstream of the phono preamp. My eyes would target that ortofon. I suggest changing to something like a Nagaoka MP-200 as a safe choice. A Hana high output moving coil is another safe choice, and frankly if you get one you likely will never put the Ortofon back.
In another direction, a relatively cheap cartridge such as a Nagaoka MP-110 would lose a little detail but might give you better balance and ultimately more enjoyable sound.