Exchange letter for "Unsent Letters"

Dear Correspondent, thank you so much for writing something for me! : D

The Flight of the Heron - D. K. Broster
Pairing: (Keith Windham & None, Keith Windham & Francis Delahaye, Keith Windham & Any, Ewen Cameron & Francis Delahaye, Ewen Cameron & Any, Ewen Cameron/Alison Grant/Keith Windham, Ewen Cameron/Keith Windham)
Epistolary Format: Books and Articles, Journals and Diaries, Letters/Emails/Audio or Video Messages
I don't think anyone has written more of Keith's journals than we get in canon--I'd love to read that! Do any of the other characters keep a journal? Do any of the canon events (or events in some AU of canon) end up in any newspapers? Do future historians write articles about Keith and Ewen (and if so, do the 21st century historians argue with the 19th century ones)? Or you could write me any of the characters above corresponding.

Jill - E. A. Dillwyn
Pairing: Kitty Mervyn/Gilbertina Trecastle | Caroline Jill
Epistolary Format: Books and Articles, Journals and Diaries, Letters/Emails/Audio or Video Messages
I would love to get Kitty's POV on what she thinks of Jill, perhaps in a journal of hers! Or perhaps Jill and Kitty exchange letters after they part? Do any of Jill and Kitty's shenanigans ever end up in newspapers?

Kidnapped - Robert Louis Stevenson
Pairing: Alan Breck Stewart/David Balfour
Epistolary Format: Books and Articles, Journals and Diaries, Letters/Emails/Audio or Video Messages
Does David keep a secret diary--or perhaps Alan keeps one? Perhaps we could get to read some of their correspondence when they are apart? It would also be interesting to have either of them correspond with someone else and for the Alan/Davie relationship to be implied/suggested in the letters. Or perhaps some in-universe future historian writes an article about their relationship, comparing the text of the book with what is revealed by other evidence they left behind?

"Mr Rowl" - D. K. Broster
Pairing: Hervey Barrington/Raoul des Sablières, Hervey Barrington & None, Hervey Barrington & Any, Lieutenant Hunter/Raoul des Sablières
I would love to read Barrington's journal, where perhaps he reveals more of his backstory and how he is affected by Raoul. Or perhaps some of his correspondence with his sister? Or, of course, you could write me some correspondence between Hervey and Raoul. The post-canon scenario I would love for these two is for Hervey somehow to be captured by Raoul and the tables turned, but perhaps that might be difficult to write in the form of journals/letters. (I would prefer that Barrington not lose another ship in an embarrassing manner, though--poor man.) Although that scenario might work as journal entries? As for Lieutenant Hunter, perhaps he engages himself somehow in trying to get Raoul's sentence lightened, after being so impressed by his sense of honour?

Things I enjoy in general: fork-in-the-road AU:s, historical specificity and period language, outside POV, the way that letters are often constrained so that characters have to hint at their feelings or might feel the need to project some image of themselves.
Things I don't enjoy: Change-of-setting AU in historical canons (but I love canon divergence, and I also enjoy adding supernatural/fantasy elements to the canon setting), non-con/dubcon, infidelity, body horror. Please treat canonical female love interests kindly, if they appear in the fic.