Perhaps I can get the ball rolling by giving my own thoughts.
Strut position Here it is without click:
Loading: moving the upper end of the strut will transfer loads from the LH post to the RH one; the latter is capable of such change. The loading on the supporting girt is close to a one point load at center, and will not differ. The rafter max span will decrease a little, but a 3x4 (actually 8x10cm, standard in this neck of the woods) is well capable of holding the present.
Tension and Compression: In present perpendicular position, the strut will fairly squarely be in compression from dead or live loads; the brace joints (to girt and to strut) also. If the move to right were large enough, then the brace joints would go into tension, undesirable. However,the queried change is about 1ft horizontal which will be counteracted by the down/outward thrust from roof slope.
Jointing: common rafter to plate jointing may be effected with a step-lap seat, where the former meets latter at an angle; current position denies this opportunity. This may be the deciding factor, though other joints are possible.
Brace (strut) to queen post angles:
Bracing in lower corners is usually impractical, but here is an opportunity where it isn't, in fact, it increases access to loft space (between QPs). Bracing in upper corners is practical at 45deg
or steeper. In lower corners, the converse argument applies. So this is OK!
