The Spartan CQB tool is a much better version of the SOCP which seems to often come extremely dull with a super obtuse edge. That said if you buy the SOCP and get it professionally sharpened it can be awesome. The sheath has holes in it so you could easily attatch it to your belt with zipties or paracord. Also even with just the clip you can put it down your waist band, not just your pocket.
I assume you are looking for a small blade for protection should somebody try to grab your pistol. Since I live in an urban city these small concealable close range “last ditch” knives are a personal favourite of mine.
Please watch videos on the SOCP as it is designed exactly for getting an opponent off your gun and then for you to be able to fire with the socp still in your hand. (The spartan cqb tool works the same way)
Check out the Gabe Suarez Grab and Stab and Gang Unit, these are awesome blades designed exactly for what you are looking for. The Kabar TDI is good too, though not my favourite.
Grab and stab is bigger knife and gang unit is smaller.
Another awesome blade is the Spyderco Street beat. When it comes to wearing an edc fixed blade on your waist band this one is one of my all time favourites. Lightweight compact and ready for anything.
My personal favourite is the Shivworks Clinch Pick. Like the Grab and Stab it is a backwards knife designed for in close edge in techniques. Basically you stab it in and use your strong back muscles to tear it out. The edge in blade cuts on the way out. If you like this one look up SouthNarc, an ex undercover cop who devised this system.
Check out Fred Perrin’s stuff, he is a master of these urban self defense blades. Also Brous Silent Soldier Neck Knives make great little belt sheath knives and punch daggers.
The non ringed fixed blade knife in this one is a Spartan Enyo. The other non ringed is a Perrin Tri-Folder. (Trifolder is not what you are looking for)