Something very commonly used in landscape materials is fade between two different UV scales. One for closeup, and one for distance. This stops repeating patterns.
You can do this fine with triplanar. Instead of changing the UV on the texture, you just change the UV pin on the world aligned texture nodes.
I assume the same is possible with variations. If you’re using noise to fade between two textures, you can still use noise to fade between the outputs of the triplanar nodes.