I bought the thread protector to remove my front sight before the optic mount was even released. Kel Tec sells it direct. I don’t need irons as backup, but I do have a green laser I can use if my optic fails.
If you need to run a flip up, I understand he folding front sight by Red Lion is a nice piece. For the rear, I have an MCARBO peep installed so it does not autodeploy, but the next time I open it up, I’m going to be installing the rear sight delete block offered by Performance Services.
For me, a riser is not a best case solution. The farther the optic is mounted from the barrel, the more elevation adjustment required to get on target at distances different from your actual zero. IMO, the mounting requirements introduced by the AR Buffer Tubes have desensitized us to ridiculously high mounted optics. We are used to seeing optics mounted high and bullet drop reticles are a thing because the buffer tube prevents us from sighting an optic mounted close to the barrel.
I’d mount the optic as close to the barrel as possible while maintaining an achievable sight picture - the low riser in your case. This is my primary targeting solution so it’s suitability is critical. Now I’d fit my secondary targeting solution to minimize it’s interference with my primary solution. So, live without secondary which will likely not be used, install secondary irons that can be folded out of the way, or get creative with your secondary system.
In my case, the laser is zero’d at 10 yards with the dot zero’d at 25. My thinking is the laser is fastest and can target accurately from the hip. The 25 yard zero produces good enough results out to my 75/100 yard effective range.