well, you could make an 'extras' comic, that works quite well for a lot of people and means you can post them in real time.
or you could wait until a chapter / arc ends, take a break from the plot and post your standalones as a break for the reader. this works well for bingers and current readers, and means everyone sees them, but does mean you have to wait a while to post them.
you could also compile your daily pages into a weekly update, put it midweek, and bring out the standalones on the weekend. this would pace well for current readers, but could get tiresome for bingers.