This would have been better in the setup thread, but here goes.
The Pearl is not consumed and he has one. It does not need to be done within the three hours of being found. Silly anyway as so many items are found in chests or hidden away.
There are many replacements for the Carp and things that will aid the success of the spell, but he is just starting out and will fail most of the time. The Constitution hit is only 4 pts in my game. The false answer does not end the spell.
The biggest restriction is one item per spell and the carps.
You are in a city that trains Mages, go find a Mage or a Sage to help or track down some better equipment for him to use as this will be a big asset to the party.
Sorry, but on this one, I will not budge. Nothing is suppose to be too easy when it comes to magic items. Especially when the Item can come from dozens of different magic types. Dwarves or Elven Smithing, Dunedain enchantment, Actual Wizards and Sorcerers, relics from far ages, natural magic, accumulated magic, Gems made in the depths of time by Aulë and his helpers, etc.
BTW: Don’t overlook the fact you have a Bard in training that is older than the rest of you put together. Give him a chance to look things over. It is a small chance, but the more he learns, the more useful he will be.
Finally, **Deor ** has actually heard of a third level spell simply known as ID at Distance, that is easier to use, works better, does not require handling of the item and thusly greatly reduces the danger of curses.
The fish are readily available as a Gold Fish is a carp for this purpose.