Bulk edit texture settings without using property matrix

I need to import thousands of hdr files. They are imported with the wrong size and mipmap settings, I tried to use the property matrix to edit the textures but it crashes ue4 everytime. Small batches of 5 to 10 work in the property matrix without crashing, but this would take far too long.

Is there another way to edit the texture settings, maybe a way to set the default so ue4 just imports with the correct settings?