How to Blur a texture that I'm gonna use in Landmass blueprint?

I wanna use the Landmass plugin but whenever I use the material only landmass blueprint, and put a displacement texture in, as I don’t have Gaea enterprise, the textures are spiky, I’ve tried blurring them in Gaea but that doesn’t work very well, the only way they look fine is when I use them as an alpha brush in the sculpting tool. But I also wanna access the flexibility of Landmass plugin, is there a way I can add a blur to the texture, that works like the smooth tool in landscape?

I dont know for sure, but im guessing you need a PNG16 to avoid any spikiness.

Avoid working heightmaps related things as art. Its not art. Its data.