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would a saw with negative modulation do this?

That would be similar, but not exactly the same, would it? Since you'd have to have whatever was being modulated set where it would have peaked from the modulation of the normal saw wave, I'm assuming. So it'd get the job done, but could require changing a bunch of parameters?

Maybe I wasn't clear what I was getting at, or maybe I'm misunderstanding this.

Let's assume for simplicity that the LFO is in envelope mode so it only triggers once.
A normal saw wave has its high point at the beginning of its cycle. So if it is modifying the pitch, the pitch will be higher than the base pitch when the key is first pressed, and eventually it will decrease to match the base pitch.
Using negative modulation on a normal saw wave produces the opposite effect - the pitch will be lower than the base pitch when the key is first pressed, and eventually it will increase to match the base pitch.
My thought was that an actual reversed saw wave would start at the base pitch and increase to where the pitch began with the normal saw wave.

So if you wanted to achieve the last effect described, you'd actually have to modify e.g. the oscillator's pitch in addition to setting the LFO to negative modulation.
At least, that's what I'm thinking; maybe I misunderstood this or what was being requested.

Ok, that answers my questions - thank you.