Welcome to the forum! And congrats on the new 4566TSW! One of the finest 45s made. IMO of course.
The factory Xenoy grips are thinner than the Hogue rubber grips. They are also redily available at Midway and Numrichs as well as on the auction boards and fleabay. While they are thinner they are not quite as thin as 1911 grip panels. They are close though.
By "removing the levers and installing the plugs" you will have to render your 4566TSW double action only. Given the lack of interest by the factory in doing anything other than selling plastic guns, I don't know where you would look to have this done. It is not something one should attempt on their own unless you are a factory trained armorer.
The gun that comes with the features you are looking for is the 4586. It was also made with the TSW features as the 4586TSW. It is slick slide and DAO from the factory.
You may find someone who has one to trade with you here. Or you could place your gun for sale and purchase one with the proceeds. In my experience they go for less than the TDA guns, usually, and it will be probably less money than the conversion you are contemplating in the long run. Good luck! Hope this helps! Regards 18DAI