Your proposed system might actually work, as long as you make it clear how many pages are uploaded during every update (perhaps putting multiple comic pages on a single update page might work?) I have experienced confusing multi-page updates before (Kukuburi, which has weekly dual-page updates, comes to mind. Raine Dog, which updates one chapter at a time, has a link at the top that directly goes to the first page of the latest uploaded chapter, which is a good, working system).

Next to that, I want to congratulate you on sticking to your schedule for the first chapter. Though understandable, it’s always a bit annoying for me to read a comic with an irregular update schedule, and it’s a good way to lose readers early on. Hmm. Maybe I should start subscribing to RSS feeds, considering I read Dresden Codak, who sometimes updates twice in a week, and then doesn’t update for two months…