I have some serious reservations about trying to cram all of the 'Tale of Aragorn and Arwen' into the Season 6 frame. Keep in mind that our frame generally consists of about 4-5 minutes of screen time per episode, spread out over 13 episodes. So in the end, we are telling a story in 1 hour, broken up into small episodic segments. We don't have the storytelling capacity to introduce a bunch of different characters and events in the frame. If the story you are describing is too much story for a single episode of Silm Film, then it is too much story for the Season's Frame. If you can picture this...it would mean that Aragorn's adventures as Thorongil will be squeezed into maybe 2-3 episodes of frame (which means we tell that story in about 8-12 minutes). So, we will essentially inform the viewer that he is Thorongil, and that he's having adventures....but not show any of them. I would definitely expect the Thorongil story to be a season-long Frame in its own right.
We have done wildly different things with the Frame each season, and I'm willing to try something new that we haven't done before. So, just because all of the other Frames have played out over about a year of time for the characters, doesn't mean we have to keep doing that. But...I do think it's too ambitious to show Aragorn grow from Age 20 to Age 50, meet Gandalf, travel from Rivendell to Rohan and Gondor, and then go to Lorien where he is reunited with Arwen and they get engaged, then back to Rivendell to get Elrond's non-blessing (and oh, by the way, his mom dies). That's....just way too much. We don't have the screentime to establish all of those locations and characters. We might have to switch to voice-over narrative to let the viewers catch up...and that is definitely seriously undesirable!
The Season 3 Frame was very 'active' - meaning that a lot of events were suggested to take place. Too many events. Estel is hanging out with the Dunedain, meeting Halbarad and his son Hamilcar. He and Hamilcar strike up a rivalry, and it's the Long Winter transposed there, so there are wolves invading. So far so good. But people also wanted to visit Bree, seeing the Prancing Pony and its current landlord. And involve Gandalf. And the Sons of Elrond. And have a story where hobbits from the Shire were alerted to the issue, and Bilbo organized them to repel the wolves. As we were plotting this all out, it soon became clear that it was WAY TOO MUCH PLOT for the Frame to handle. So we streamlined it to a story of the Dunedain fighting off the wolves to protect the Shire, with cameos by Bree and Gandalf(?), and Elladan and Elrohir as supporting characters. No hobbits, and the main focus is on the Hamilcar/Estel rivalry. Elrond and Gilraen appear in bookend episodes 1 and 13 only.
Speaking of the twins...at some point, we might want to have an Elladan-and-Elrohir-centric Frame, probably. They've been supporting characters in the Frame of Seasons 1-3, and we do plan a story where one of the twins goes overboard on the whole revenge thing. .
I do love how everyone who is suggesting a love story in the Frame is underselling it as hard as possible. Like, it's an absolutely terrible idea, but.... Eöl/Aredhel and Aegnor/Andreth (as well as Haleth/nobody) are major stories in Season 5. We're allowed to have a tragic love story in the Frame! I realize that no one is thrilled with the idea of an elf pining for Arwen or a hobbit lass pining for Bilbo, but I don't think there's anything inherently wrong with the suggestions. Could that subject matter be handled in a super-cringey way? Sure. But it wouldn't have to be. If Arwen is travelling outside Lorien again, interacting with the woodsmen she met in Season 2, she could have Lothlorien elves along with her as guards. (I dunno - Haldir or somebody). And it could become clear that Haldir loves Arwen but she has no interest in him, so she lets him down gently. (Just so long as its not her brothers taking him aside and threatening him with a shovel talk!)