Re: IEC 61010 3rd Edition - When devices are listed to the 2nd edition
You seem to be mixing some requirements/directives.
Equipment is either covered by Medical Device Directive, or it isn't - even if it's "borderline", it doesn't "sit on the fence", it falls under one or the other.
Fully Applying Harmonised Standards gives a Presumption of Conformity. When your existing Harmonised Standard is superceded, you are not actually required to do anything under LVD or EMC Directives (but might be under other directives) - you can choose to still declare to previous standard.
Should you wish to update to latest standard (and this would be the "recommended" approach) then check what has changed that applies to your product, perform any required tests, update Technical File and issue new DoC.
Since you're following CB scheme, also talk to you're test lab about when they will be able to assess to 3rd edition and give CB cert.