Targeting the 500 hours on type requirement will not do an awful lot of good I fear. Sometimes it can be insurance requirements, sometimes it can be experience requirements and other times it will be little more than a filter. My current employer has recently hired but looked for 500 on type and wouldn't even think about dis-including the requirement simply because of the shear volume of applications they get WITH the requirement. The number of applicants who would have paid for line training is likely 0 (partly due to the aircraft type).
The thought behind the idea is good, but it suggests bargaining with airlines and entering talks with them as a group of unemployed pilots. The problem is that this group holds little or no cards and therefore has little power in discussions.
This approach needs to be on a much larger scale involving a pan European pilot union which includes employed, contractors and unemployed alike.