Your options for the superlight are basically limited to the PRI front flip sight with the 0.625" gas block diameter. You can also get a 0.626" front flip sight from GG&G, but that setup requires taper pin installation, which isn't your average DIY project. Both of these are ~$200 options, the GG&G being more probably with the 'smithing fees required for installation.
OR
Stick with your standard FSB on the superlight.
If you step up to the Dissy barrel, more FSB options open up to you, but the forward FSB on a Dissy barrel is a nonfunctioning sight. Once again, your options are limited to clamp on style sights again, like the PRI. It can and has been done. The issue is that the barrel forward of the shaved, functional gas block is around 0.720" and most standard gas blocks are 0.750", thus the need for a clamp on that can squeeze down to make up the difference.