If you haven't been near a SEP in that long its going to cost you serious amounts of money
What 2 years? I was away from SEP flying for almost 15 years and spent just 1.5 hours refreshing then straight into a test on the same day and passed. This was with Dickie Bird at Wycombe Air Centre who doesn't sign licences lightly.
A few months later, I did some IR exercises for an hour then did my SEP IR rating.
The PPL/SEP skills I'd learned 20 years ago didn't just disappear with years of multi turbine and heavy jet in the meantime but I think there are some instructors/examiners who might like to make it hard for people who already have the flying job they so desire.