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I know that this can be done with Origin client, but never done this with the steam client (just putting the files in the steamapps folder and trying to download the game so that steam checks it and find the files already there) I've never tried that, but i guess it's worth a shot.
To your second question, the game saves are located in your documents folder, so no you should not lose any progress.
1. Buy steam version with all DLC.
2. Hit download. At this point a window will pop up asking where to install to. Install to any place other than your GOG game directory.
Then start download, wait till you see it just start download. After it ques for download. Then stop the download and cancel download.
3. Now exit steam completely.
4. Open your installed GOG W3 root directory and copy (not move) all content to the steam games root directory. When it prompts to merge say yes, then when prompted to over write say yes.
5. Now go to control panel->Programs and features. And uninstall GOG version. This is needed to remove GOG registry values.
6. Now launch steam. Your W3 game button should now say "play". But don't play yet.
First right click on W3 game in games list. Go to properties. A window will open.
You will see a few tabs at top of window. Click on "local Files" Another window will open. There will be a list of options. Go to "validate game files". This will check all files and then download any missing or corrupt game content.
7. Now go back to game list and hit "play" This is needed so steam knows Redistributables are installed.
8. After first play of game. And before second play. Delete the shortcut on desktop for W3. Then open games root directory->bin->x64 and goto Witcher 3's exe and right click->send to->Desktop. This will put a shortcut on desktop to game engine instead of game launcher.
When I did it this way. I can run W3 without steam running at all. Hope this works for you as it has for me. Sorry for long info. Didn't want you doing it wrong. Then having a bigger mess.
https://www.gog.com/wishlist/games/witcher_3_gog_version_to_steam
http://www.nexusmods.com/witcher3/mods/2134/?
Why would you pay again for a game? The question is how to transfer the game you already paid for.