as much as i am absolutely not for using centralized exchanges to buy btc...if i were a client i would simply onboard users to strike since it has,an lnaddress. prolly not like primal but id just have it in my sign up process...a link to their app or something to nudge them that direction. you get fiat rail, ln address, zap capability ( not one tap but still pretty good). thats how id differentiate my client to try and pull more people in.