You could, but personally I'd take one that doesn't have an impetus to it. Maybe the free 2/day thunderwave. However, you can stack the platiing, a shield and the ram for +6 to AC, since gear works as normal for the character. Throw in warforged, defense fighting style, +3 modifiers to heavy armor and shield, the shield spell and a cloak of displacement and you got a 38 AC with the enemy having disadvantage. Jokes on monsters, they might as well attack your chair for all their chances of hitting you.
The note at the end is that the shield doesn't protect the chair, which is of course useless, and a holdover from the less overpowered V1 that presumably had an AC and hit points.