If 7 is OK, since the 47D uses the same tube as the 47, you could replace the 47D guts with the 47 guts. You'd get a better spring and follower.
Here is the 47 replacement spring and follower https://wilsoncombat.com/spring-foll...5-acp-7rd.html
Here is the HD/+P option for the 47. It uses the spring from the 10 rounders. https://wilsoncombat.com/spring-foll...-hd-p-8rd.html