Thanks for your response bcworkz
I did manage to do what I intended following this post:
https://kau-boys.com/2047/wordpress/translate-customizer-options-with-polylang
It took me a while figure it out. But basically, following the post, I changed the teme code so each time I change the value in the customizer, the strings were updated in the polylang strings.
Then I had to change the page templates so the used the pll_e function to display the translated texts.