The way I do it is by using "opening reference" on either my TWIC database or MegaDatabase 2013. Then I will put in a position I like, for example starting position of a6 Slav, and then I'll copy down the names of 2700+ (I will go lower a lot of the time) GM's who play it frequently. I will then do another search on another opening position I like, such as: Berlin, Na6 King's Indian, Caro-Kann, Marshall Attack or certain Najdorf positions. And if any GM's appear in more than one of my searches, I'll do a dossier search, and quickly play through a lot of their games, to see if their style matches my own, if it does, this is a GM I'll follow. 

From the White side I like: Kramnik, Gelfand and Radjabov.
From the Black side: McShane, Malakhov, Ju, Bologan, Bacrot, Jobava, Wojtaszek,

And you can do it the other way around; if there is a GM you think will be a close match, you can do a dossier on that GM to check his/her repertoire. But you can only do that for one GM at a time.

There may be such a function in newer Chessbase versions, but I'm not aware of one in the dinosaur Chessbase 9 which I'm still using.

Many GMs play some of these as backup lines to their main (sharper) repertoire. But Sam Collins himself should be a good match, as is Sergei Tiviakov (except for the Caro). John Emms has also written about most of the lines you mention; he has played the French Tarrasch regularly for years but not sure about the others.