1962-1967: Sean Connery (still I think Connery is the reason the franchise was sucessful in the first place and no other actor could have done the same)/Patrick McGoohan (I know he turned the role down on moral grounds).
1969-1971: Jeremy Brett/Terence Stamp
1973-1985: Michael Billington
1987-1989: Lewis Collins
1995-2002: Sean Bean/Paul McGaan/Adrian Paul
2006-2021: Clive Owen/Dominic West/Sam Worthington/James Purefoy/Julian McMahon
Sean Connery was OK as Bond (although I prefer him in other roles) although him being first, gives him iconic status (I guess?) Stanley Baker might have been a good choice (or for a total tonal shift, Michael Caine might have fitted the role.....albeit in Harry Palmer mode?)
George Lazenby was the *perfect choice for a replacement (IMO the only perfect Bond movie, as it stands)
As much as love Moore (who is my favourite Bond) he could have been bettered by a bunch of other actors (although none of them British) I'm glad he wasn't.
Had Lewis colins taken over (coming off 'Who Dares Wins' around the time of Octopussy) he could have (at very least) filled in, until Dalton (who was another underrated and underused 'Bond') although I have soft spots for Moore's final movies (especially AVTAK)
Brosnan (who I never really liked initially) has become tolerable (if not favourable) by default of the utter disgust in what Daniel Craig brought to the franchise (personally, I'd have rather had Scott Adkins as 007 from 2006 onwards) although it would pain me to see him in the corporate, box-ticking, SJW, watered-down bullshit that Craig has been headlining for the last 15+ years.
Scott Adkins is a great choice
share1962: Cary Grant. (Was wanted by producers but would only commit to one movie and so was passed on). I disagree that no other actor could have done the same, Cary Grant was a mega star even in his late 50s and Dr No would have been equally successful if not more so.
share1962-67: Oliver Reed. To me, Bond is always equally thug and gentleman, but even while being a gentleman, always has that sense of menace and violence. Reed does that perfectly on top of being an impeccable actor. He's not as handsome as Bond is typically depicted, but he cleans up just fine. While I agree with you that Connery was the perfect Bond, because this is alternate actors, I thought I would offer up a true alternate. Heck, with Reed's drinking, it's possible he'd have even needed the hiatus between On Her Majesty's Secret Service and Diamonds Are Forever.
1969-1971: Michael Caine. A couple of outings with Caine would have been wonderful. Caine could have brought some Swingin' '60s/mod to Bond without making it about that. In other words, it would have been delightfully "of the era" without dating itself and aging to embarrassment. I like your suggestion of Terence Stamp; he'd be really great.
1973-1985: Anthony Hopkins. Might've needed some lifts or clever camera tricks to bump him up by a few centimetres, but Hopkins would have brought the chilling demeanour of a killer, the class of a gentleman, and the wit and humour needed for Bond, although not as cheery and prone to winking as Roger Moore. Peter O'Toole would be a good alternate.
1987-1989: Jeremy Irons. Although Dalton is one of my favourite Bonds, I believe Irons could replace Dalton's hardness.
1995-2002: Peter Capaldi. He clearly has all the attributes, and although he's a bit slighter of frame than most other top-choices, maybe he'd be willing to bulk up a bit. Plus, then we'd have the Doctor and 007, plus a Scottish connection. Your choice of Sean Bean works for me, too. I also considered Daniel Day-Lewis, but his overly "arty" approach might clog the fun up. Plus, his method acting would produce a second baby boom wherever they filmed.
2006-2021: Jason Isaacs. He basically played Bond in Jackie Chan's film The Tuxedo, and would've rocked 007. I definitely love your choice of Clive Owen, too.