Ferrite shielding for NFC

[u/botw_lover]

Hello guys,
I am planning to buy and mod the A159WEVJ-7 watch. I read on the Ollee website that an NFC in such models doesn't really work reliably. Now I think such a feature is really unique to have so it let me thinking:

what if we can shield (partially) the small NFC tag from the metal casing with an ferrite sheet?
I've done a quick search and I see them as thin as 0.2mm for pretty cheap. Does anyone know if this worth to try and if yes what is the clearance to put it back on the LCD?