I have a similar request… ie, a SmartApp or two, but that should be simultaneously submitted / accepted with a Device Type Handler update.
I guess in many cases the Device Type Handler update could be submitted first as a prerequisite. But Device Types must be a bit harder to get certified. Ideally I’d start with just an incremental change to the existing Type, to help ensure approval.
Overall point… Device Type Handler approval is nearly as important as SmartApp approvals.
And… Ideally there should be a mechanism for Customers to select from a (short) list of multiple choices of Certified Handlers once a signature matches… @Tyler?