My question is, why would you want to drain the lube from there?
That lube in there will be serviceable for way longer than the life of the clutch.
You have to take all of that off the next time you change the clutch anyway.
You mention that you do not have any leaks there now. That is rare. Should you develop a minor leak in that area in the near future (quite likely), fresh fluid will seep down from the transmission to replace what leaks out. Problem solved.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission