I'm under the opinion that Skyloft should be legal in vanilla, anyways.
And no, I definitely think we should consider different stages for SLHG. The changes in physics is notable enough that it alters the dynamics of certain stages. Platform height becomes a much more significant issue, hence why I suggested ditching Duck Hunt, and low ceilings, while still providing earlier kills, are somewhat nerfed in that aspect. And while I've always liked Halberd I was beginning to think that the low ceiling was an issue in vanilla, in SLHG we have a chance to reconsider its place in the stage list.
A different stage list is a pretty dumb reason for people to ignore something, to be quite frank. We already have different regions running different stage lists, customs on/off, things like that. Either way modelling SLHG's ruleset after vanilla is the wrong way to go. Things that might make sense under vanilla rules, such as 2 stocks 6 minutes, or rules surrounding the usage or banning of custom moves, simply cannot apply to SLHG. And I think stages fall under that and deserve to have a second look.
When the subject of banning Delfino from SLHG came up a while ago, I debated in favor of its legality because the main concerns with the stage were that certain transformations made it impossible for players to get out of the water...but I was able to prove that wrong by testing the stage out with characters like Little Mac and Ganondorf. To me, the main thing that stands in the way of stages like Halberd and Pokemon Stadium 2 from being legal are the excessively early KOs that occur on them in vanilla. But if SLHG mitigates that effect, while still offering those things as a feature of the stage for counter-picking purposes, then they should be reconsidered. If we still ban them then that's fine, but we should at least show a shred of legitimacy and do it after proper testing and experimentation of the stages. Not just because it might scare some people away.