The standard 75 variants (75B/75BD, SP-01/SP-01 Tactical, P-01, Rami, Phantom, etc) are not swappable between decocker and safety. There are no parts that you can purchase to "convert" your decocker to a safety model. There are however parts you can purchase to tune the decocker model variant you own. There is misinformation around the internet that the decocker models are somehow inferior to the safety model. This is false. They can both be tuned to the same degree and both can result in a superb trigger.
The omega variants are changeable between safety and decocker and generally come with the parts to convert it in the box.
Oh and the parts are not interchangeable between the standard 75 variants and the omega variants.
I'd suggest you shoot the gun you have to break it in and see how the trigger improves. It will smooth out over time as parts wear in to each. If you want a safety you are going to have to look for the standard SP-01 variant.
Cheers,
Toby