You can try if you have a test database. You can try on even production if you have solid recovery plan if something goes wrong.

Other alternative is build the tablespace on a different server with the same OS and Patch level and Oracle version and plug it in with current production. I did once for data tablespace like this not for system tablespace.

It scares me to give advise to play with system tablespace. What if when I attempt to do it on production. I can't think about it.