This might be old, but today I just realized how you can wear both hatched and crowbar without dropping your primary weapon. First of all you need a crowbar which you can then use by pressing F to switch between the fire modes and once you've got a crowbar you can also remove hatched from your toolbelt which will then give you an option to use your hatched through the F key as well. This is only possible once you got a crowbar as you can't remove hatched from your toolbelt otherwise if you have a primary weapon equipped.