Just remember newer generation gearbox dont comes with oil pan so there is no need to search for it.Do not open the black steel cover normally in front of the gb trying to search for the atf filter as its not there,only the solenoids are there.I don't have a Inspira. My ex-Sylphy I DIY installed a CVT cooler and I routed the inlet on top and outlet at the bottom.
Depends on what you wanna do. If just drain and top up it's about 3-4 litres. If remove oil pan, change filter and all - then 5-7L total
These type of gearbox also have filter and the par price is just slightly higher than normal oil pan type filter.However to get to the filter require removal of the gb.
I've seen some mod where people install filter using the atf cooling line but not sure will it have effect to atf pressure.