They look really useful
And iff the brush ends up to be rubbish, or when it eventually gives up you could probabyl use your modeling skills to make a switcheroo with your other favorite brush.
Edit; just a thought, when they are teaching children to write at schools they often have rubber grippy things that slide onto pencils which encourage those with difficulty to be holding it correctly. Is there a similar product, or could it be made, to slot onto paint brushes to provide a more substantial grip.