It’s wonderful to perform with a symphonic orchestra.
I had never used the diatonic mode on the harp before, so I didn’t know about it, but after experimenting, I understand what you mean.
If transposition is acceptable, how about raising the Diapason by 2 semitones? Like A = 440Hz → 493.9Hz.
In that case, I think it would be better to choose a Full Rebuild rather than String Tension.
Please refer to section 7.2 "Temperament" in the manual.

good idea, as the tuning is memorized with each preset.
But I'll have to know exactly which frequency will give 1 tone higher, at different diapasons (don't know actually if it'll be 440 hz, 441, 442 or more).
Easier with the transpose button of my DP (only 1 press to activate / desactivate)

As I'll play the harp + celesta parts on my digital piano, with an symphonic orchestra (they couldn't find an harp player), I'm setting up presets for quick changes.

There are glissandi to play with the harp, but in D major tonality. I have to click on the "c" to go in diatonic mode, then select 2 black keys, in order to make C and F sharps :
that's 3 manipulations to do, but I've not the time during the music playing.

I tried to save a preset with this configuration, but I see when I recall it that the sharps I selected are not memorized, only the diatonic mode, but in C major.

Shame because it's faster to change a preset (only 1 click, or affected on 1 key on the laptop keyboard). Would be great to offer this possibility !

I've got an idea : using the transpose function of my DP, setting it to +2 semitones. Then I could play the glissandi in D major while doing it on the white keys. And that's just one button click to activate transpose. Will try it soon

There are glissandi to play with the harp, but in D major tonality. I have to click on the "c" to go in diatonic mode, then select 2 black keys, in order to make C and F sharps :
that's 3 manipulations to do, but I've not the time during the music playing.

I tried to save a preset with this configuration, but I see when I recall it that the sharps I selected are not memorized, only the diatonic mode, but in C major.

Shame because it's faster to change a preset (only 1 click, or affected on 1 key on the laptop keyboard). Would be great to offer this possibility !