If you don't have the ability to merge, would the copies get equal rights as the original? Or would the original control all the resources and the copies get treated as second class citizens? If the copies were second class citizens, I would probably not fork because this would result in slavery.

If the copies do get equal rights, how do you plan to allocate resources that you had before forking such as wealth and friends? If I split the wealth down the middle, I would probably be OK with the lack of merging. However, I'm not sure how I would divide up social relationships between the copy and the original. If both the original and the copy had to reduce their financial and social capital by half, this might have a net negative utility.

If the goal is to just learn a new skill such as drawing, a more efficient solution might involving uploading yourself without copying yourself and then running the upload faster than realtime. I.e. the upload thinks it has spent a year learning a new skill but only a day has gone by in the real world. However, this trick won't work if the goal involves interacting with others unless they are also willing to run faster than realtime.