I believe Stormy has a point, actually. If we’re going to advocate for tweaking specific pokemons’ family items, then I think the more important discussion to have first is by what method to re-assign the typing of absorb items in general. While I agree with the 4 pokemon you’ve pointed out, I don’t think quashing the discussion on the bigger picture is warranted here.
There are a lot of cases where the type-absorb family items overlap with globes and the like, as well as some cases where the quad weaknesses are ignored, and of course the few that actually protect against only neutral damage. Where do we draw the line? Should the priority be something like x4 weakness not protected by globe > x2 weakness not protected by globe > x4 weakness protected by globe > x2 weakness protected by globe > weakness a pre-evolution has but not one the fully evolved pokemon shares? Should abilities like Levitate, heatproof etc. be taken into account? I don’t think it’s fair to just start listing off our personal favorites and ignoring the rest.
Until we know what the actual “rules” we want to set are, it’s hard to consistently judge what should and should not be adjusted. Since as you mentioned, Scizor and Forretress have had their items changed, I do agree that there’s precedent for further alterations.
The problem with this though is that, unless the weather required to grant the speed is different from the relevant crystal, these items have 0 utility later on in the game, which hurts their potential for progression as they just kind of fall off.