I think that brain wallets for Stellar (something like Bitcoin's BIP 39) can actually be useful. The main use case is an offline wallet you want to store in a safe place with a larger amount of cryptocurrency. In Stellar, you are OK with simply storing your account secret key (or keys for multisig) but the thing is you can make a mistake in one or more character when writing it down.  With brain wallet it's not an issue because words you write down are selected in a way that eliminates similar words and mistakes. And if you really want to store your wallet in a brain, it's much easier to remember 12 words that 56 characters.
I wrote this doc recently with a similar idea but using emoji . https://gist.github.com/bartekn/c877987b722ec792912d720921a7418c Looks like a joke and was meant to be a joke but if you think about it, it can be useful if you put emojis in a 16x16 grid with each emoji in a standardized position. It should be easy to remember, I need to try to implement this finally.
You should definitely post a link to your app here.
 Obviously for larger amounts you should try to send small amount first and see if you can withdraw it using the process you will be using in a future.