Kuivert isn't really an out and out striker though, he's more similar to Zaniolo. Beto has almost 4x the minutes Duran has and still less goals (I know Serie A / background but someone like Scamacca still only managed 3 PL goals). Richarlison, yeah I'd expect that since he cost 60m and is Spurs best out and out striker.
I think the issue is we aren't going to get a good "back-up" striker while Watkins is always going to be 1st choice. And TBH I'd take Durán over all of those who you mentioned except Richarlison (Not including Isak as he would start over Wilson, but Wilson would be too expensive to be on our bench)