Talmadge Huckabee suggests that a good source for a Nextion noise reducer choke (2.5mh) is to get a toroid (FT114_43) from kitsandparts.com and wind 70 turns of #22 wire on it. This has about 1 ohm of resistance so it will not have much voltage drop (and will not dim the brightness of the Nextion display).
The All-band HF Amateur Radio Transceiver: Just waiting to be modified