To be fair, “melancholy and sentimental” is also how I’d describe “Burning Homestead,” especially considering the scene it was originally written for 😃
Honestly, I think if there’s a way to extend what Williams already wrote for the “I am all the sith/jedi” scene (to account for the extra shots of ghostly jedi) that might be the “best” solution, but I think the trailer music version of Leia’s theme could work as well. Probably from :30 to 1 minute.
There are various clean versions of that music available online - and I’m certain there are more than a few orchestral/string recreations of it to be used too. The most famous one is a recreation by “samuel kim music” should be pretty easy to find on YouTube.
Another idea might be to use the version of the Force Theme that Williams originally wrote for “Rey catches the Saber” in TFA, which then got tracked over by Burning Homestead.