Thing you need to look very carefully are.
A. perlite does not retain any water so when you are using 50% which mean you water level in your medium will be very low.
B. You can not use continuous flow system as you are using cocopeat it may drown your plants.
C. You will be using a method which is Flood and Drain system.
Advantage of perlite is High oxygen retention level
Coco peat is High water Holding capacity can be also a downside if you do not calculate how much to water .
positive side is coco peat is a great hormone rich and fungus free medium for our plants
One more you need to be care full when using perlite is Potential particle inhalation danger.Cover your mouth and Nose when applying perlite.
When it comes to recycling the nutrient I am more concern on the EC and PH fluctuation in between every irrigation, Since you are using coco peat it will hold the nutrients ,The water which is drained will have very low EC and may have high PH so when recycled for second watering after few hrs it will change the whole EC and PH of also your medium. checking every 2 hrs manually the ec and pH will be not practical. you can also try either totally with perlite and use recycling technique or go with 15% perlite and 85% coco peat and do not reuse the nutrients Just Drain to waste.
There are many who reuse the nutrient when using coco peat as medium, good luck and keep posting .
I would suggest you to go for a small filter connected to the drain to reservoir other than the mesh filter,Because even small particles can form to gather in your pump and stop working in a weeks time.