I would suggest making some cards with public address, maybe a QR code of it easy to scan. Again all of that is public don't carry your private key on you.
I never recommend using an online vanitygen if they don't offer split-key generation.
First letter will always be '1' for a vanity address because it can't create multisig address now. So you don't need to remember it. So next 6-8 letters will be related to a word you won't forget. So now you already know first 7-9 letters. Remaining 10-12 letter can be studies easily like you study a phone number.
Vanity address also contain the word you want in middle or at the end of the address but creating one which have the word at first is recommended for easy_remembering.
However, to reduce the hassle, I suggested to use 'Firstbits'. It will help you to remember the address easily.