Sage of Legaia
Rogue
Not all Focus things have roleplay requirements, but most that don't are Monster Abilities; Regeneration, for instance, doesn't have any listed requirements, nor does refitting Natural Armor, Rifting, or Gaseous Form. Meditate is in the strange territory where its "requirements" are so broad they encompass everything from reading a spell book to running combat drills, but ultimately you just have to look like you're practicing whatever it is you're Meditating back.
Arcane Armor just says you have to Focus for one minute, but doesn't list any further requirements, so I think it's entirely fair to treat it like Meditation: as long as you appear to be concentrating on refitting your Arcane Armor (holding the item in front of you, looking at it, maybe have your eyes closed, maybe be talking or chanting something quietly to yourself), then I don't see why you couldn't walk while doing it, same as you can walk around reading a spell book to Meditate back a spell, or be engaged in active swordplay to Meditate back an Eviscerating Blow.
Arcane Armor just says you have to Focus for one minute, but doesn't list any further requirements, so I think it's entirely fair to treat it like Meditation: as long as you appear to be concentrating on refitting your Arcane Armor (holding the item in front of you, looking at it, maybe have your eyes closed, maybe be talking or chanting something quietly to yourself), then I don't see why you couldn't walk while doing it, same as you can walk around reading a spell book to Meditate back a spell, or be engaged in active swordplay to Meditate back an Eviscerating Blow.