A casual read says the safest easiest setup is everyone doing all their work on a recent iPhone model. Good news is, assuming the budget requirement can be met, this is pretty close to what is already happening for most people.
One point I would make is that it’s rather easy to make Siri only respond after unlocking, but that’s probably out of scope of this training — and not something staffers are going to remember. For added security, disable Hey Siri, too, because that’s a hot mic. (But again, scope.)
(Unless you’re saying a gaggle of Chamber of Commerce suits from Topeka can navigate party politics, secure funding, get attention, get nominated, then somehow win without DC experience and connections in leadership.)
Edit: 'idlewords — I tried to reply to you before you deleted; Congress or a Congressional campaign means a national race, and toned my replies here. You and Thomas are talking about state legislature races, apparently, which was not obvious until your deleted comment. We don’t identify state-level legislative bodies as Congress, which is a term that means the entire national legislative body, not just the House. It’d be half appropriate to say congressional without a capital C, but still weird. Gotta enunciate state.
I genuinely thought you were training early campaigns for next national, the way you worded it. You should, honestly. They don’t get awesome advice.