Hi there @chanson, awesome to have you in the Fitbit Community as a new member. My apologies for the late response and after reading your post, I'm not sure if this is going to work.
Note that you are able to open your Fitbit account in different mobile devices, due to your tracker is syncing through the Fitbit app and not the bluetooth setting sof your mobile device itself. So, by consequence, the apps on the phone in use, will have access to your tracker, speaking in relation to the notifications.
However, due to bluetooth limitations, your tracker might only be able to communicate with one phone at the time. These issues are typically caused by operating system and Bluetooth limitations.
Nonetheless, I'm going to leave the topic as optional to try. Just keep in mind this limitations or the issues of communication this may produce.
See you later and feel free to share your experience if you were able to try this.
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