Multiple Zwave controllers for better lock code management?

My question, boiled down to its essential elements, is, “Can a non-SmartThings device be monitored and/or controlled by a non-SmartThings controller simultaneously?”.

Specifically, I purchased a Kwikset 910 Z-Wave lock. I know it can be set up on the ST hub. I see that I cannot issue custom codes through ST. I was considering the purchase of a Z-Wave controller like the Mesa Verde thinking I could monitor, open and close the lock through ST and add codes separately through the Z-Wave.

Will this work?
Is this the simplest solution to this requirement?
Given my need to issue custom access codes on almost a weekly basis, am I solving a ten cent problem with a hundred dollar bill?

A zwave or zigbee device can only belong to one primary controller.

It’s technically possible to set up SmartThings as a secondary controller to Vera (much like the Aeon Minimote becomes a secondary to SmartThings), but the results are rarely quite what people want, so it isn’t done often.

For example, many devices rely on Association to report status, but can only be associated in one group. So even if Vera and ST agree between themselves that one is primary and one secondary, only one would get the status updates from say, an eco-link sensor.

Also, locks are a separate category because of the security requirements and this also tends to mean they will only report to the primary. You can sometimes get around that with virtual switches as status indicators but it gets really complicated.

Before we get too far down the path of what you might do with multiple controllers, there are community developed smart apps and device handlers that provide a lot of custom code management for locks. They are certainly worth looking at.
But they still don’t give you all of the functionality the lock is designed for, so it comes down to exactly what you need.

Lock Code Manager is very popular, for example:

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