Flamestrike
Legend
That's really the only solution as there is no "rules solution." Here are the relevant rules...
"Normal activity, such as moving and attacking, doesn’t interfere with concentration." - Pg. 203
"[A character taking a short rest can do] nothing more strenuous than eating, drinking, reading, and tending to wounds." - Pg. 185
I call 'eating, drinking, reading, and tending to wounds' = normal activity. And 'normal activity' doesnt interfere with concentration.
I mean, If I can maintain concentration while stabbing someone to death for an hour (attacking), then kicking back for an hour over a hot brew and eating a trail ration doesnt interfere either.
You lose concentration when injured (sometimes) when you cast another spell with a duration of concentration or when incapacitated.
Not during a short rest.
The intent of spells with 8/24 hour durations is that they last for the whole [6-8 encounter/ 2-3 short rest] adventuring day unless shut down via damage or casting another spell.
This is confirmed by the Devs. I see no reason to punish Warlocks by changing this rule.