If it renders otherwise unplayable records playable, then why not? After all, you'd only need to use it with those and could set it aside for everything else.
I'm not a fan of clamps either, especially not massy ones, but the OP seems to be contemplating using one to help flatten some 'slightly bent' records. I agree with you that there are potential problems that would mitigate against using one routinely. I guess it depends how 'bent' 'slightly bent' is, and whether that renders the records unplayable. And if so, whether a clamp would fix matters. If it did, then the downsides in terms of noise or other distortions might be acceptable for the small cost of a clamp, if the OP has several records he'd like to play but can't.There are some reasons. First, there's a risk of coupling bearing noise into the platter (although that seems a bit academic on a decent bearing). But second a weight isn't really going to work to flatten a serious warp, while it's not easy to see how something would clamp to the Rega's spindle. Given that the point of modern Rega decks is minimal mass, you're also potentially adding quite a lot of it.
IME, the only one that really works for the is SME one, which screws down.
If they are really knackered you can try the oven/sheets of glass method - carefully
Aye only if they are totally knackered, was sceptical myself but a mate brought an old Manics LP back from the warp of doom, it plays fine now and is nearly flat. Ran it on my Techy and it played through fine.VERY CAREFULLY! I tried it a few times without success. If they still play I’d leave it.
The SME or any lightweight clamp would be ideal if it’s not too heavy and it clamps securely to the spindle on my P8. I don’t want a really heavy clamp for obvious reasons explained here.
The Pig?I seem to remember from a friend who had a Rega TT years ago that he had a plastic/rubber puck (possibly supplied by Rega?) with very low weight that fitted tightly on the spindle that you just then pushed down on the record that seemed work for dished Records or small warps.