If the film has an effective antihalation layer, a chrome plated pressure plate won't cause problems.
If you actually want halation as opposed to flare (overall loss of contrast due to light scattering within the lens or inside the camera), you need a film with little or no antihalation layer. Fomapan (in my experience) isn't that film. If you don't mind spending the money for color and its processing, Cinestill's rebranded Vision3 stocks have *no* antihalation (though that will change soon as Kodak switches from remjet, which Cinestill removes or pays Kodak to leave off, to a more modern antihalation layer).
If it needs to be black and white, you'll probably be best off with a duplicating stock (very slow films, but not intended for high contrast subjects since they're contact printed from a cine negative strip), though you might try a roll of Cinestill developed in B&W chemistry (it'll have a strong orange mask that makes it hard to print in the darkroom, but it still scans okay). Film Photography Project has a number of these slow duplicating stocks, and if you give them a call or email, they can probably tell you which ones have the "worst" halation.