Or if I put a full 3x2 all the way along do you think it would look odd with a slight slope once it's all finished?
On a 3 meter length? Works well enough for furniture leg lengths, thoughYou can make a guide by screwing a hinge to the end of two long strips of straight timber- so they are side by side and hinged at the end. Then you can open the other end to create any angle you need, and either fit a fixed piece of timber as a third side, or make a part that is adjustable.
Putting that alongside the fence means that timber fed into a table saw will be cut at An angle
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