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I do think sexuality is at least somewhat malleable. I could never see myself becoming homosexual, but I can easily see how I could have been or could in the future become bisexual. I would be adding a new sexuality on top of my old one, figuring out a new way to have that experience.I won't go into a long story but TLDR: I thought of myself as gay from puberty until a couple of years ago, I am now entirely bisexual. I don't know if the side of me that is attracted to women (I'm a guy) didn't exist a decade ago and my sexuality changed, or if it did exist and I just didn't know how to access it. But it certainly was a definitive change, previously there just wasn't any sexual feeling towards women in my head, ever. Despite this personal experience of sexuality being malleable in at least some form, I am still entirely confident that homosexuality (including the gay side of bisexuality) cannot, at least with our current scientific knowledge [0] be purposefully changed, and while I'm lucky enough not to have a personal anecdote about paedophilia, everything I've read up on the subject makes me believe the same goes for that.
[0] I say current scientific knowledge because who knows, maybe in X years/decades/centuries we'll fully understand the human brain and be able to modify it as precisely as you can modify a computer program. Setting aside the fact that this advance in science/technology would probably do far more to scare me in terms of how it could be used negatively vs. benefits such as removing the attraction to children from paedophiles, since we are no where near being able to do this we might as well keep the debate within the frame of what we actually can achieve in the foreseeable future.
> I fail to believe paedophilia is the only mode of sexuality that's open to most or even a significant fraction of paedophiles.
It's known that there are paedophiles who no matter how hard they try, and get supported with therapy/etc., never find themselves attracted to adults. It's also known that there are paedophiles who find adults as attractive as children, or also attractive but more/less so than children. It's very hard for anyone to find out how many of each because paedophiles in general often prefer not to talk about their condition, even to medical professionals, and especially paedophiles who can be happy in adult relationships probably don't have much motivation to think about fixing their attraction to kids, since they can have a sexually-fulfilling life without them.
(Incidentally, my gay->bi sexuality is why I find the subject of paedophilia from a medical point of view fascinating, since it does seem that they are very similar things biologically, just not culturally. And no, I don't mean that because they are similar biologically that they should be similar culturally, I fully approve of saying homosexual relationships are good and adult/child sex relationships are bad.)