There is now an actual product for modifying old sports jersey nameplates
Jersey Nameplate
Custom Eagles Nameplate - Set your jersey color, set your name
How to personalized NFL football jerseys - Quora
One Color Custom Nameplate - Choose your colors, set you name
Satin 7/8 x 2.5 Perpetual Base Nameplate
【SIZE】 Nameplate : 14.6*3.3inches; Text height: 2.4inches 【OCCASIONS】 This jersey back nameplate patch is suitable for football jersey. It's
GENG Custom Nameplate Stitched Name for Football Jersey Your Name Design
A.J. Brown Philadelphia Eagles Pro Standard Mesh Player Name & Number Top - Black
Caps Jerseys Washington Capitals