Ending Supplier Contacts (Unused iSupplier Accounts)

Hi, we have had a process to end unwanted/unused iSupplier accounts for a few years now

But it has been pointed out it has a flaw. That is large companies we still trade with 20 odd contacts. But lets say 50% of these contact have now left the company we trade with. eg No logon in this decade.

Best explained in the context of the the attached

I can easily add an end date to the field ringed in red, via Sys Admin - Security - User - Define. And I can do this via Dataload as it is Java Form