This is really easy. You have one good password for 1pass, and one good password for iCloud.
If you can manage to memorize one, you can memorize two.
If you can manage to memorize one, you can memorize two.
I use 1P on my laptop most of the time so it's not a huge deal. Everything else on the iPhone just remembers credentials.
I know I can force myself to use a great password for iCloud but my point is that most of the time, I'd go for an idiot password rather than forcing myself. Just like most people.
for example, pass2'word would only require you to hit the alt-keyboard switch once.