I've arranged a 75 minute symphony for solo piano. This piece is obviously very long, as are its four movements, but it can in fact be relatively well divided into smaller, musically cohesive sub-units (like the sonata form's exposition-development-recapitulation). I could divide my arrangement into roughly two dozen subsections of a few minutes each; some of which even make for nice little pieces when performed in isolation.
I am tempted to supply the score with rehearsal markings at those divisions. Rehearsal marks are mainly used for orchestral works but they also serve to divide a longer work into coherent units - and in my case they may very well be useful for practising the solo work too.
However, the original (orchestral) composition had rehearsal markings too: and well over a hundred of them. Every major change in instrumentation is considered a separate segment in the symphony, which makes sense for the orchestra, but those changes are much milder the solo piano version. I prefer larger subdivisions.
If I give the arrangement my own rehearsal marks, is that confusing to any pianists more familiar with the original symphony (which includes a piano part too)? Or is it considered acceptable?
I am asking in part because my main example in making this arrangement has been Liszt's Beethoven symphony arrangements; and they take over the original rehearsal marks from the orchestral score. Then again, Beethoven did not use a hundred of those marks.