Limited validity period CF7 forms

Greetings,

I’m looking for a solution that would allow me to define a validity period for Contact Form 7 forms, that would only display then when today’s date is within the allowed period, and show a message if not.

Basically, when creating the form, one could set
– start date
– end date
– message to display
Then, when displaying the form, check the current date:
– if < start date or > end date, do not show the form, but print the message instead
– if >= start date or <= end date or both dates are not set, show the form

Questions:

Do you know of some add-on plugin that would do this (I searched www.remarpro.com without success) ?

Do you think this is a feature that could make its way into a future version of CF7 ?

Should no solution exist, could you offer any advice on how I could try to implement this myself (I know PHP but have never done any WP plugin development) ?

Thanks in advance
Damien