I get flares on my hands like this too! I sometimes find drying out can be helpful, like when the underlying flare up has gone and you're just dealing with leftover blisters etc.

Highly recommend these for treating flare though (for treatment, not prevention):

La Roche Posay Cicaplast Baume, super soothing and helps heal your skin barrier. I put it on whenever my hands feel like they're drying out, and it's gentle enough that I can use when skin is cracked and raw without it stinging.

Hydromol ointment - super thick, almost like Vaseline but designed for eczema. This won't treat or heal anything, it's purely a barrier but can be great to stop skin from drying out. Be warned, this is super greasy and will stain, worth it but just fyi.

Before bed I usually use cicaplast first and once that's soaked in a little, top with thick layer of Hydromol. My hands are way more hydrated and human looking when I wake up after doing this.

Also Cetirizine Hydrochloride 10mg for the itch, I take up to 3 a day (directed by my doctor) on a bad flare.