I suggest doing some research to see whether you can convert the gun to have a free state trigger.
It is my understanding that on the original shields, the Massachusetts trigger was done in different ways at different times. At one time, it was not easy to convert to free state parts because the springs for the Mass trigger were a different diameter, and the frame inserts were different to accommodate them. I have been told that in later production, springs could be swapped to convert from Mass trigger to free state, but I am not certain if this is true.
There are two things that I can state with more confidence. First, the free state trigger is fine. People will tell you that the Apex trigger is really better, and that is somewhat true. The Apex trigger is better than the free state trigger, but the difference is not that dramatic. For training and carry, the free state trigger is more than acceptable.
Second, S&W has no interest in helping you convert from Mass trigger to free state, so you will need to do research about what parts are available and work correctly. What I am not certain about is whether S&W will actively obstruct this process by making parts unavailable.
There are several reasons why I prefer a free state trigger over a gunsmith or Apex trigger. First, you have stated you want to carry the pistol, and I prefer stock guns for carry if possible. I am not in the camp that says carry guns must be factory stock, but I do think it is preferable if possible. With the Mass trigger in a shield, the pistol is very difficult to shoot, and arguably unsuitable for most purposes. So making some changes is pretty much necessary, but I prefer to make the most conservative change possible. If you can get the gun working acceptably with all factory parts, then that is my preferred option. That option is also likely to be cheaper than other options, and may possibly simplify maintenance down the road.
Sorry I cannot provide exact instructions, but this approximate roadmap is all I have right now. And if you have no luck with factory parts, I will say that the Apex parts are reasonable if you don't find options that you like better.