hi
To be honests its alot healthier for them to only eat dry food, it really helps to keep their teeth in good condition because it scraps of the plack on their teeth.
i have 2 young cats myself and i started feeding the on felix pouches and some dry food when we first got them as kittens but we took them to the vets for check up and they both have gingivitis whish is inflammation of the gums which can lead to bad dental problems, this is a result from them eating too much wet food so we have now begun to wean them of the wet food and increased the dry food which is going well.
I know you say that your cats are picky with their food but alot of cats are and it simply comes down to the fact that if they were hungry they will eat anything. if they dont eat the dry food straight aways then just keep persitant and leave only the dry food down to eat and they will give in, mine have, If not you could try to give it to them like a treat at first because it will fall them into thinking their getting something yummy, mine fell for it lol a added bonous is that dry cat food is normally cheaper than wet cat food so you could also save on money and could buy them new toys to help with weight and fittness too lol
I hope this helps, best of luck, Amy