question

It sounds like you should be controlling the receiving and releasing in the object process flow of a BasicFR.

You could extend the processing time of an object using delayeventsofobject() but know that this delays all events - not just process finish (so if you had message or open input events scheduled, they'd also get delayed).

For those finding this post and wishing to swap one object with another you may find the copyattributes() function useful along with the more commonly used createcopy() - where the later has the option to replace the object which will preserve any pointers to it elsewhere in the model. Some attributes my not transfer successfully where the properties are incompatible.

Connections you may want to move yourself since then you can preserve the ranks at both ends of the connections (another reason to use pointer labels for references to other objects) - the same for Groups and process flow memberships. Here's a rough example for two objects 'old' and 'new':

connections(new).subnodes.clear();
while(connections(old).subnodes.length)
    connections(old).first.up=connections(new);
if (old.attrs["Groups"]){
    new.attrs.assert("Groups");
    while(old.attrs["Groups"].subnodes.length)
        old.attrs["Groups"].first.up=new.attrs["Groups"];
}
while(stored(old).subnodes.length)
    stored(old).first.up=stored(new);