Sorry to read & see the damage, brave of you to come clean.
But I think the prop damage is looking slight enough just to need new individual blades (If you can). It's happened here twice to the same Rotax 912 UL without more than a dial gauge check !
On my own 912 the original builder put the carb. springs on for conventional opening which I've been pleased to have; perhaps that's worthy of swapping over ?
[And like someone else mentioned we were taught to keep hand on throttle control].
mike hallam.