Sprucing up a Glock? Sounds like putting lipstick on a pig. Why not just buy a pretty gun to start with, I suggest a CZ, double stack, extremely accurate, outstanding SA trigger, safe DA trigger, plus a wide selection of holsters. All for the price of a new Glock.
Most retention holsters are going to look police. My holster have varied retention, and varied styles, but the only triple retention I have is very police(Don Hume). Most of my holsters are homemade, they are tight, very tight, and use a leather thong retention. Works extremely well, is not noticeable, fast to undo, but will not come undone while the gun is being pulled up. It must be undone before any draw.
I am more concerned with keeping my distance from people than retention. If someone is already trying to get your gun by force you have problems. Where you wear your gun is also important, the popular OWB carry is behind the hip, I do not do this, mine is always at 3 or slightly less. If I go to the restroom since it forces staring at the wall I move it as far forward as I can. Most of the gun grabs, which there are few, have come from poor carry like small of the back, or back pocket. I also believe that cross draw offers more protection if the gun is carried properly. At 11 o'clock the gun is not as accessible from the back, and by turning strong side, or what we used to call the T stance puts the gun further away from the front. Very few police carry cross draw, and there are a multitude of cross draw holsters on the market. I prefer a cross draw of no more than 15 rake, preferable 10 degree, this is about the rake of combination pancake holsters which can be found very plain, and very fancy. I am guessing you could find one for well under the cost of a new gun, probably around 100 dollars.
https://www.americasgunstore.com/pr...htning-two-way-holster-for-gun-group-107-4-0/
$109 for lined basket weave strong hand, or cross draw holster with thumb snap retention for the FN. Keep in mind that most of their holsters are special order and take several weeks. Also available in brown basketweave, I just could not find an image.
I have one of these for my model 64, Don Hume triple retention, no longer made I had to search for it. Found one new for $15 on ebay.