LSD is generally much better on the road mate, no problems there.
TC may make it less 'better' but it is still better.
The
diff lock won't work in 2wd on the road.
I think if I was in your position I would check out the stealers and see what's available.
I was exactly like you and the obvious option was no locker and LSD - and auto because it is a better beach vehicle...BUT after going out into the bush a bit with some of the guys on here and also with some mates, it can get addictive and you end up with HD bash plates, Tyres, sliders etc
That is when you want the locker.
BUT...by all accounts the TC does give you much better off road ability than ever before to the point of "maybe" as good as a locker - or close, and if all the story's are correct from the last couple of years...Triton's with lockers can be a 3-4-5+ month wait.
There is also the option of adding a front locker later if you really like the bush - it IS great fun
The wait for a locker is the killer and now with TC may not be worth it - especially if you are only doing what you say with the car.