When saying "vis-à-vis" in English, would you pronounce it veez-uh-veez before a word beginning with a vowel sound, as you would in French?
No, the pronunciation in English never includes the second 's'.
(UK) IPA: /viːz.ɑːˈviː/, /viːz.æˈviː/
(US) IPA: /viz.ɑˈvi/, /viz.əˈvi/
Or roughly, "veez-ah-vee" or "veez-uh-vee" whether before a vowel or a consonant.