It is a pretty weird and unusual setup! In fact, quite unique! The old manuscripts... yeah, they are pretty damn messy... these sonatas, the ink from from the opposite side and seeped through, so that is why it is so hard to read. Although, the clean pages are also pretty messy to start off with!
I love programming the concerts... definitely consider that to be part of the artistic side of things. Creating a concert arc that will interest and hold both the audience and the performer is quite an interesting puzzle... and I will lose days in a listening and researching rabbit hole as I find things that I want to programme for years in advance! Much more so for our field, as we are often playing things that are quite rare or forgotten and not the rehashed regulars.
At least you won't run out of ideas for ages XD Do you outline stuff that you think would be a good idea so you've got something to start with in the unlikely event you get stuck?
Oh yes... I have enough ideas for several years worth of concerts! Often the problem is trying to contain them for a single program so that it doesn't explode the concert length!