I wrote a script to convert some of the old events to the new plus format. There is a total of 36 events.
Follow instructions for the omnipack from an earlier post, and then put the A999 folder in the options folder. I have been playing through a few events, and everything is working. Progress is being saved properly in Aqua (using v0.31)
I am new to how chunithm game files works, so use at your own risk
A999.zip