Not sure on validating the 5hr piece, but on the removing it off the mount piece, it's easy enough to remove the mount while standing. But I'm not sure I'd actually try what you're proposing, which, I believe I've summarized below:
1) Continue pedaling down street, avoiding small poodle
2) Complete a reach-around, grab camera, and slide along the pole until removal
3) Still pedaling, dodge runner with headphones in the bike lane
4) Remove MicroSD card from bottom of unit
5) Still pedaling
6) Stash Fly6 in back pocket, grab phone
7) Place MicroSD card in phone
8) Avoid hitting grandma
9) Open video editing app
10) Import in file from MicroSD card
11) Nearly lose phone to unseen pothole
12) Complete video editing that rivals Blair Witch
13) Start upload..wait...damnit, only in 'E' cell service!
14) 22 minutes later of waiting and pedaling, upload is complete
15) Insert MicroSD card back in Fly6 from back pocket
16) Start to complete second reach-around to put Fly6 on rear mount
17) Get hit in head by soccer-ball from neighbor kid, luckily, your subsequently epic crash is captured free-form like a drone by the Fly6 as you and it fly through the air
18) Upload video to YouTube
19) ST gathers, watches...enjoys.
Roughly.
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My tiny little slice of the internets:
dcrainmaker.com