Here’s a project that includes a modified version of the included “Simple Arpeggiator” to which I’ve added a ‘Chord Mode’ that plays all the keys held down repeatedly. This works differently to the (stock) note repeater script as it repeats indefinitely whilst the keys are held down, and unlike the note repeater function built into logic, the notes you actually play are recorded as midi data that than the repeated notes.

This also means it works on pre-recorded chords in MIDI regions and is obviously non-destructive.