Well there are several issues at play in your post.

To begin with, your comment makes it sound as if you believe that changing back to R12 will prevent you from charging it every year. If you have to charge it every year you have a leak. A leak is a leak, regardless of refrigerant, although some refrigerants can sometimes leak at different rates.

The hose issue. You would not have to change hoses to go back to R12. What you WOULD have to do, is break every connection and flush every component, remove the adapter fittings, replace the r/d put in the correct amount of mineral oil or a synthetic substitute, evacuate and charge with R12.