I can understand why you want it gone, but TBH, I have never heard of any treatment that will make a fully formed splint disappear, sorry.

If they are still active it is sometimes possible to minimize them by icing, blistering, laser etc, but I actually think if it's settled you're more likely to make it worse if you start messing with it.

The only thing that might work is actually operating on it I think, but then you're left with scars, which is just as bad, from a showing POV.

I'd leave it for now and just see how you get on.