Not possible, if you split the pump into 3, I dont think your beckett skimmer will work.Even if it works, definitely not enough bubbles.
Previously. I use 1 rio pump to drive skimmer only. In my opinon, I dont think the rio32 pump has 7500Lph as you will need to factor in head losses due to piping, height factor etc..and I think its overated by the manufacturer. If you really want to split into 3, suggest to use pressure rated pump e.g. MD55 /MD70