Your idea for a build is very general, you might want to make it more specific. Also your second post seems at times conflicting with what you wrote first. You either fight in melee or you don't at all.
Versatility is in fact - not very versatile. It basically is only useful if you use light firearms like SMGs and pistols to put points into DEX rather than PER and to a lesser degree certain semi-obscure experimental builds.
You can take enemies from stealth with basically any weapon as long as it is not too loud but in most areas you are off to fight a battle against many opponents with no chance for stealth.
>I'm also not that interested in psionics featuring heavily
TM is basically a win more button. There isn't really any tactics with it, it just gives more AP and an ability to be immune to everything for a while. It's the least psionic psi class.
Here are some relatively noob friendly example builds i can suggest:
Knifer + throwing:
https://underrail.info/build/?HgMQCAUDBQYAPADCoMKgwqBQAAAAABkAAAoAAAAAAAAAADkxJhYSEwY8S1xRAE5BwrNC4p2NBeKfhAHip74G4qi7A9-_Spear + throwing:
https://underrail.info/build/?HhAHBgYDAwUAwqAAwqAoAGQAAAAAAAAAAAAAAAAAAAAAOSYkFsKUBsKsEjxLwpVODT7CtuKfhAHis6ID4rOkA-K3iAXit4kC378As a general rule, feel free to slap as much stealth/throwing as you want if you can afford to invest the skill points. They are basically support skills, not really meant as a main focus of a character.