So I've put together the hotend assembly, grub screws and all. With the cheaper heatsinks, it seems that it'll intersect with the bottom bolt after all, so I'll move the hotend out and center it so that there's no X displacement.

I'll take this opportunity to also raise the hotend so that the centre of mass is closer to the X extrusion, and so that the Z-min endstop doesn't need to be significantly raised.