Replacing feathers with plastic mesh skirt

Very neat idea, and props to you for trying to upcycle old shuttles. I just don't see myself going through the hassle of doing it.

 

You might want to consider giving Nylon shuttles a try
There is a lot of prejudice against them, but they aren't so bad at all.
The differences I've noticed with them is, that they feel a little "dull", they don't turn around as quickly as feather shuttles, which is the same issue you described with your DIY shuttlecocks.
You notice this e.g. when you play net spin shots.
Most club players like myself will use worn shuttles for training and use new ones for training matches, but Nylon shuttles are completely fine for hobbyists or occasional players.
You could also look into Hybrid shuttles like the Forza Hybrid 5000, they generally tend to hold a lot longer compared to conventional feather shuttles like the victor service or AS-10
Generally, I still think this is a good idea, and if it works for you, I'd say it's a great alternative
(wow, out here typing an entire essay on this topic )

 

Hybrid shuttles are dope. I'll always advocate for them.

 

Cool idea, the issue will be , that there's most likely no rotation involved. Rotation of a shuttle is very important and enables players to play more advanced shots (slicing, tumbling,spinning). The same reason many prefare feather over plastic. Plastic shuttle are so constructed, that they rotate too, thought not as much as feather. If budget is an issue, I would test out plastic shuttles, they last out much longer.

Juniors will either get the used shuttles from the seniors or plastic shuttle in many clubs. Many, not all, will lake the necessary hit quaitly to let a new feather shuttle survive long enough, nor did they benefit from using stronger rotation (sliced shots). But if you want to advance in your skill set, feather shuttles are mandatory due to their flight characteristics.