Keychain issues with external bootable drive

Background:

I have a laptop which appears to have developed a logic board fault. In preparation for taking it to the Apple store for diagnosis and repair I replaced the internal drive with a bare OS install. I moved the internal drive into a USB3 enclosure and am option-booting into the OS on the USB3 drive. With the original laptop this works flawlessly. I have access to an alternative laptop, of a newer vintage. I was planning on option-booting the alternative laptop into my USB3 drive so that I can collect email and other things while my laptop is off for repair.

System Specs:

I expect, as a long time Apple software developer, that the question below likely has nothing to do with the specific hardware that I am using. All computers and drives have Mac OS X 10.9.5 installed. The old laptop is a MacBookPro8,2, 2.3GHz, 16GB RAM, 250GB internal drive (a temporary replacement) with an AMD Radeon HD 6750M. The new laptop is a MacBookPro11,3, 2.5GHz, 16GB RAM, 500GB storage with a NVIDIA GeForce GT 750M. The drive which was previously installed in the old laptop and is now in the USB3 enclosure is a Samsung Electronics 840 EVO-Series 1TB 2.5-Inch SATA III.

The Problem:

When I boot the alternate laptop and log into my account all of the passwords in my "Local Items" keychain disappear!

More information:

I have determined that a new "Local Items" keychain has been created that appears to be specific to each machine. A new directory with a different UUID identifier was created in ~/Library/Keychains. Each machine does not have access within Keychain Access to the other machine-specific "Local Items" keychain.

I have not found a way of locally transferring my passwords into the new "Local Items" keychain because when booted into either laptop the other "Local Items" keychain does not appear within Keychain Access.

I do not have iCloud keychain turned on and do not want to turn it on.

Irritating to implement workaround:

Copy all of my keychain items into the login keychain and empty the "Local Items" keychain. The login keychain is preserved between option-boots on the different hardware.

Preferred Solution:

I would prefer a solution which doesn't have me working against what Apple is obviously doing in relation to the iCloud keychain even though I don't want to participate. It would probably work to turn on iCloud keychain and then turn it off after the passwords are transferred — this is not an acceptable solution because I do not wish for my passwords to be stored on Apple's servers even for a short period of time.