Obviously Vivek has zero chance of getting elected either on his own or as Trump's VP
I’d say you haven’t been paying attention. Biden had no shot at winning the nomination in 2020 until all of the other candidates dropped out and before Super Tuesday and supported him .
If the Swamy gets support from elites ,(they love irts like the prime minister of the uk) he could easily find himself in a similar position if the Republican Party decides to actively screw Trump and Desantis support fizzles
But I don’t know how far Vivek can go, he isn’t conservative at all and I doubt he was ever a registered Republican