ErwinS
What you telling in generic terms is a common mistake.
Sending your airplane wherever for maintenance? Fine. But how many exactly EASA Part-145 providers are there for DC8-70 and who are them? And who are the shops releasing components with EASA Form 1 for this type?
Experienced guys and hangar space? But do they have EASA certification for this type and rating still valid?
Sim check in US? Tell me which US sim for DC-8-70 is certified according to JAR STD? And are there any JAR FCL licensed SFE/TRE for this type who's license is still valid?
I can't think of any insane flight crew member who is still keeping this DC-8 rating current on JAR license, especially considering this is nearly mission impossible.
It is possible to do all of that from scratch but the cost will make the project no-go.