Maybe like this
Just put it inside the Right Columm of a new ShortCut
but write "script:" on the beginning of the line!
So
script:var cln =0, gd = moi.geometryDatabase, cl = gd.getObjects().getConstructionLines(), cll = cl.length;
for (var i=0; i<cll; i++) if (!cl.item(i).isTemporary) cln++; if (cln == cll) { gd.removeObjects(cl) } else { cl.setProperty( "isTemporary", false ) }

Launch the Dimension Script
Call the script of persistant lines
Draw your helper lines
Draw your Dimension
Draw your helper lines
Draw your Dimension
etc
ps I have no more the Button OK that is normal ?