Joking aside, I think having large broms suit the frogs better in that they have larger "pools" to utilise.
Ideally get down to the nearest garden centre for advice and you may see some that could be suitable even though small in size that have broad leaves say and deep areas where water collects.
Smaller Neoregelias, such as Fireball and Super Fireball, would suit smaller vivariums.
Look at any of the neoregelia most stay small. Wild tiger, mini skirt, any of the fireball varieties, domino, alley cat, Tunisia are all nice ones I have tried that don’t get very big.