To transition from outside to inside will be a nightmare as your light will change so much, so quickly that you'd most likely need a second person controlling camera settings. When I mentally fly through what you're being asked to accomplish I have to ask; are you that good? Are your sticks that steady? You're being asked to perform a camelback type motion with crane like stability accompanied by smooth pans. That's a lot to ask for. Even though you don't have an OSMO, no matter how well you think you can control the Z axis on an osmo, if you're not tracking something you're going to easily see the bounce.
The worst thing you could do is say yes to this project only to not be able to pull it off successfully. If you're asking questions about it, you're probably not ready to try and tackle it; at least not in one take. You might have to tell your company to get a little more realistic about what they're asking you to do, but back that statement up with what it would cost an experienced production company to pull off this continuos 1 shot "commercial" they want you to do for them.
Alone, you could probably pull it off in two shots (but again that depends on your skills) because the moment your camera makes the transition from outdoor natural light to whatever light is indoors, something is going to be to under/over exposed.
I would tell your boss/marketing whoever that there's no way you can pull it off in one shot. If you can pull it off in two shots to look like one continuos shot you'll need to set your camera for the outdoor conditions fly to just before you cross the threshold or to a point where the settings change drastically from outside to inside, hover your drone, change the camera settings and continue with the flight indoors. In post you can add a very quick transition (something like a digital glitch) or something that ties the camera changes and flight movements together with the least amount of interruption as possible.