One piece. Two ways to make it fit.
PlayableNotes worked example

Edited screenshots from the real workflow; waits shortened. Piano audio rendered from the exported MIDI.

00:00:00 — HEAR THE ORIGINAL
Listen to bars 7–8 of the checked original. The left hand changes under the melody.

00:00:08 — SIMPLER LEFT HAND
The same passage after adaptation: the entire right hand stays, while the left hand has fewer attack moments.

00:00:16 — THE SAME VERSION IN C
The adapted version in C is exactly seven semitones lower. Choose the key and register for the reading task.

00:00:24 — 01 / READ THE PDF
The actual one-page PDF was uploaded. The product counted six lines and quoted six credits before reading it.

00:00:33 — 02 / CHECK THE READING
All 32 bars were compared with the printed edition. No note corrections were needed in this reading. Recognition still needs checking.

00:00:42 — 03 / SET THE TEACHING BRIEF
The editor was asked to preserve every right-hand note, both repeats and ornaments. The left hand should use no eighth notes and no stretches wider than a fifth.

00:00:52 — 04 / CHECK THE ADAPTATION
The first adaptation introduced a large downward jump in bar 23. We restored the original D, so the preceding C-sharp resolves up a semitone. The correction is saved in the final version.

00:01:02 — 05 / CHANGE THE KEY
After the web editor could not make the key change, we used the PlayableNotes plugin to save a checked transposition. Every voice is seven semitones lower.

00:01:11 — 06 / EXPORT THE LESSON
All three scores were exported from Studio as PDF, MusicXML and MIDI. The complete downloads are available beside this walkthrough.

00:01:19 — BRING YOUR NEXT PIANO PAGE
Try the workflow with a piano page you teach. Reading new pages uses credits. Changes, playback and exports stay free.