You're right, the early serial number LA211s, under 30000, had the valve attached to the loader frame, not the loader attach frame.
It looks like you could make a mount to move the control valve to the loader attach frame, then change the fittings on the valve that go to the loader to add quick couplers to them.
Or, if the hoses are in good condition, you might be able to have the hoses cut, like maybe a foot from the valve, and put new ends on the cut ends, then put couplers on them at the breaks. Just be sure and mark the couplers so you get them reconnected properly.
It shouldn't be too big of a project to do that.