Welcome to FT.

I won't say it is impossible. But it is definitely something that you don't want to try.

1. Even it is allowed (I did not know if it works or not), you will lose a huge amount of value.

2. SIN- DPS is not long (like about 2100 RDM RT). What's the point of making a huge trouble for that?

3. Most SQ fare classes, as Guy Betsy said, do not earn full miles. Sometimes, you get none.