I'm guessing the will do fine. Probably will stay a lot smaller though. They're really susceptible to stunting in high flow and with their root systems spanning across entire tanks I'd imagine they wouldn't be too happy in a little cup.
Yep that might be right. I have noticed that swordplants stay smallish in Tank Planters. Crypts, on the other hand, are not limited that way and grow pretty big even when their roots totally fill up the planter.