The newer S2+ metal switches come with a clear membrane vs black, so you should be able to replace the switch with a lighted switch and see some light come through. Though it will be a lot less than an S2+ with a rubber tailcap. And it will probably affect how your flashlight functions, so you may also have to install a bleeder resistor on the driver. Here’s a great BLF link on installing lighted switches: D.I.Y. Illuminated tailcap.