Why don't they allow react? One reason I can think of is they have a server side side rendered architecture and they want people to continue to use that. They don't want new devs to use company time to buff their resume with unmaintainable learning front end code. At least that's why I generally shoot down attempts at using FE js frameworks over here. We have some really awful react 0.11 pages that are years old that will take weeks to redo properly.

Anyway, my point is you might want to check if it is okay to use any FE framework at all. It seems like a very strange policy to say "you can use any FE framework except React".

But if you are going to do this use Vue.