i had a similar issue with my chiller. the inlet was leaking and it was also metic. I ended up heating some tubing with boiling water and pushing it over the pipe then cutting the pipe short and inserting a barb fitting to FPT fitting. Good luck.
I've got an reeflo orca skimmer. It came with a metric to imperial conversion sleeve. It may be eaiser and quicket to try and find one than waiting for piping.
You can see the gray sleeve connecting the skimmer to the white imperial pvc. View attachment 11451