There are two somewhat different solutions to what I think you and @Eric are looking for:
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A version of temp override that would only adjust basal but would not alter ISF or CR, otherwise Loop would continue to do its closed-loop as usual, or
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PDM-style command to the pod to do a certain temp basal for a certain amount of time, during which Loop would not make any further alterations.
Approach 1 would likely be easier to code, and I think I might be able to give it a try - will let you know if I make any progress. Approach 2 is more complicated because it would require going down to the pod driver code (which I would not be able to do, since it is more complicated, and I do not even use pods, so could not do any testing). But, there is an open Loop issue that has lots of interested users, so maybe Pete or someone else will have it included to Loop at some point.