Take a stopwatch and click start every time you enter a cloud.
Press lap button on exit. Lap again on entering and so on.
This will give not only actual IR time, but accumulative IFR total time.
Then, find the biggest weather pattern, or storm cell. Head straight into it and disconnect autopilot on entry. That way you're guaranteed to get genuine hand flying in IR conditions.
I've tallied up about 317 that way over the last 15 years
Works a treat