@RoleyPoley:

That is very possible. The idea then would be basically to replace the Colle-Zukertort, the e3 Queen's Indian and the "Anti-Colle systems" with the ...e6 Torre, however you would run into the problem Kylemeister mentioned: While 1.d4 Nf6 2.Nf3 e6 3.Bg5 is fine, 1.d4 d5 2.Nf3 Nf6 3.Bg5 is probably less appetizing than 3.e3.

One solution is to learn the London system (2/3.Bf4) instead if Black insists on an early ...d5. The Torre and London seem to appeal to the same kinds of player. 

Another is the one Burgess advocates: Go into the Queen's Gambit with 3.c4, but choose relatively calm, controlled lines (though his g3 gambit against the Triangle and Semi-Slav breaks with that pattern).

Thank you gwnn! Yes I know about it, but I'd like to compare suggestions with other authors, see if some lines fit me better.

That's exactly the point kylemeister. A naive attitude such as always playing 1.d4 2.Nf3 3.Bg5 against anything does not interest me at all. But i would like to play lines, not necesseraly mimicing the same scheme, but in the same spirit as the Torre : flexible, relatively low on theory, strategical, etc. I like to understand what I play, not to rely on memory nor to play on autopilot.

I suppose you know about "A cunning opening repertoire" by Burgess already? It seems to fit your description so I'll just mention it in case you don't know it. Note that he only covers Bg5 against 2 .. e6.