[@Lugubrious] I feel like you should've checked the character before accepting him, even given that he was put into the guest list first. With that in mind, I have stated before that many of those abilities are things Crue can't do, having not taught himself how; I'm perfectly willing to reduce his vampiric arsenal to what you've suggested and limit the fatality of Heavy Fuel and the Anti-Ripple, perhaps by arguing that "it affects beings from non-JoJo settings less effectively for unknown reasons" or whatever (the actually-undead entities aside of course, who would be correspondingly less affected or even benefited from a Dead Ripple charge), though I'm tempted to suggest that zombification may also be an ability vampires can perform as standard, given that all vampires have "vampiric essence".

There's also the matter of Motley's Lightning Mode, basically his version of the freezing technique, though I'd imagine it's more limited defensively speaking, since where Dio could just lower his body temperature at the point of impact, Motley has to go through a somewhat more complicated procedure of internal rearrangement. If you like, I can explain the Lightning Mode and the associated techniques I have in mind in detail in a PM, or else whatever works for you.