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There’s not much you can do directly with search or P-Max as far as specific devices go.
You might consider nixing P-Max and replacing it with Demand Gen. At least in that campaign type you can target very specific devices by operating system or model. This would take care of all your non-search traffic.
You might also try either keyword and/or creative qualifiers indicating your solution is only for iOS. But of course, that’s going to disqualify your desktop traffic so you’d need to split the campaign. One campaign targeting only computers. One campaign targeting only mobile and then using the qualifiers.
