Powershift service frequency for reliability?

[rudi]

Been thinking , I know I shouldn’t 😁
Might get a mondeo diesel wagon . Need big internal space. Surfboards kayaks to fit inside.
Obviously I’ve read a lot about the failures of the Powershift (wet clutch) and it’s suggested regular servicing reducing the failures. Or does servicing regularly and on time, failures are a non-event?
So made me think servicing more (50000ks)? Might keep the chance of failure even less likely?
Now to the main questions
Wet clutch Powershift is there a failure rate available to understand the gamble of getting a mondeo?
Any idea how many failures in cars that have adhered to the required services?
Last one
I’ve read in the UK some service people flush the oil through the transmission with a pressure pump to help force the crap out. Is this a normal thing transmission specialists do here in AUS?
Last last one
And it’s pretty weird and shows I think too much 😂
Anyone fitted a secondary external filter with a finer screen and with small electric pump to keep the oil moving and moving the debris through to the filters to keep oil cleaner for longer.

My commute is 20 minute highway everyday 100/110kmh then 5/10 minute stop start lights to get to and away from work in city. So not much start stop to worry about.
Cheers