Certificate options

I’m going to be releasing a bunch of e-courses this Summer and was wondering if we could have the option of our own ready made certificate given once all the video lessons have been watched instead of the Heysummit one. This would be like a completion award PDF they can download. My courses are all for fun and creativity and I’d like to give attendees a colorful and less formal certificate of completion they may like to print and frame. The heysummit tracking is still useful because I only want them to get it if they do the lessons and complete the course so it would essentially unlock this PDF in place of the other. If this isn’t an option, would it be possible to have a bonus lesson unlocked or not viewable until they’ve completed them all and I can add it as a piece of media to that lesson?