No: "It is not possible to remove a database icon from the Notes client workspace using LotusScript, JavaScript, or Notes API." in technote

Notes/Domino 8 Forum

Subject:

http://www-01.ibm.com/support/docview.wss?uid=swg21097270

You're stuck using formula:
path := "escape\\the\\back\\slash\\in\\folder\\name\\db.nsf";
destSvr := "NewServer/CERT";
@If(@IsError(@Command([AddDatabase]; "OldServer":path));"";"");
@Command([WindowWorkspace]);
@Command([WorkspaceProperties]);
@Command([FileDatabaseRemove]);
@If(@IsError(@Command([AddDatabase]; destSvr:path));@Prompt([Ok];"Adding";"not there");"");
@Prompt([Ok];"Swapping workspace icons from old sever to new server complete.";"DONE")

Feedback response number WEBBA4M83L created by ~Ben Dwogeroplopynds on 11/26/2015