Ok, so you wanted an answer from a Gunsmith, not a fellow Taurus lover.... here goes :
Like auto manufacturers, Taurus used the same basic frame and slides but did different internals to make the DAO and DA/SA separate weapons. There is some extra tooling on the frame and maybe on the slide, aside from the different internals. And maybe other changes between generations too, that do not show in the manual.
I feel confident that I could convert one if I really need to, I hesitate to say "YEAH GO FOR IT!" because I do not want to be responsible for any problems you or anyone else could have.
It will void your warranty...
I understand that you have a special situation of sorts to deal with, living where you do and why this could appear as an option. My advice to you is study the diagrams and determine on your own if it is a project you wish to attempt. You will need to obtain all the required parts from Taurus or make them yourself. Not knowing if we could get parts and the cost of the parts could make it very prohibitive too.
To help you out a bit... study the diagrams and make note of which parts are on the DAO and the SA versions. The manual uses a (a) for DAO and (b) for SA models and a few things are listed as (optional). In the parts list that tells you what name goes to each number, you will see the (a)&(b) used. If you can get these parts, there is a chance you could swap out your DAO to a DA/SA. (notice you may not need to buy a new slide...

)
Keep in mind that you are proceeding at your own risk...