Thanks to @Zapp @Hyr0n and the ANDnXOR badge team for the suggestion of custom printed dye sublimation from CustomLanyards4All.  We selected the doubled ended lanyard with plastic j-hook upgrade to avoid the metal hook from shorting out any connections:

https://www.customlanyards4all.com/double-ended-lanyards/ldeds-2-detail

We ordered quantity 330 lanyards to have some extra in case of any issues.  The planned number of badges is 300.

The shipment just arrived today!