The only thing I would change on the monoflow system is, to install at least 2 automatic air vents at the highest points of your heating system or if that is not possible, you can install 2 ball valves with a hose bib in between.
This will allow you to isolate each side of the valves and bleed the air from the hose bib with a high flow rate. Shut off one side and then bleed from the hose bib (attach a standard garden hose to hose bib). Re-open valve and shut off the other side and re-bleed. It may take a few tries to get it all out. You can have more control by throttling the valves.