Hello
The charging port is able to be accessed to plug the charger in even when within a recess,
If as this on the outer side of the blind end not the bracket side.
If required a small or large extension cable can be purchased to make charging easier and accessible to plug in.
https://www.blindsbypost.co.uk/somfy-parts/somfy-uk-3pin-charger-v2?fast_search=fs