Get the engine to lower height and blendmap resolution?

So here’s my idea. Let’s say I have a landscape of 1k by 1k. But my PC is trash. So is there a way to get if I set my gfx settings to low the landscape will scale 200% in the X and Y direction and the resolution will lower to 512*512(or whatever resolution UE4 uses near that number). Or maybe even on “Epic” get the resolution to upscale to 2k by 2k and scale the landscape by 50%.

And if it is possible, will I have issues with (procedual)foliage?