Embedding AppleScript code in if/else statements is cumbersome

When using AppleScript code that contains variables, handlers, etc. its very cumbersome to embed this as one has to repeat variables and handlers in the if and else statements. Else they will not be found.

Example:

// Record enable a print track "MxPrint" and mute it in case it isn't already muted
var track = sf.ui.proTools.trackGetByName({ name: 'MxPrint' }).track;

var wasRecordEnabled = true;

if (track.getFirstWithTitle("Track Record Enable").value.value != 'on state')
{
  wasRecordEnabled = false;
  track.getFirstWithTitle("Track Record Enable").elementClick();
}
  
if (track.getFirstWithTitle("Mute").value.value != 'on state')
  track.getFirstWithTitle("Mute").elementClick();
 
if (wasRecordEnabled)
  sf.system.execAppleScript({

// Notification via AppleScript and UserNotification CLI
script: 'property usernotificationCLIPath : missing value\n' +
'set usernotificationCLIPath to POSIX path of "/usr/local/bin/usernotification"\n' +

'activate application "System Events"\n' +
'tell application "System Events"\n' +
'   using terms from application "Pro Tools"\n' +
'       my notifyAsProTools("MxPrint", "Track was already record enabled", missing value)\n' +
'   end using terms from\n' +
'end tell\n' +

'activate application "Pro Tools"\n' +

'on notify(theTitle, theSubtitle, theInformativeText, theIdentifier)\n' +
'   set notifyParameters to ""\n' +
'   if theIdentifier is not missing value then set notifyParameters to notifyParameters & " -identifier " & theIdentifier\n' +
'   if theTitle is not missing value then set notifyParameters to notifyParameters & " -title " & quoted form of theTitle\n' +
'   if theSubtitle is not missing value then set notifyParameters to notifyParameters & " -subtitle " & quoted form of theSubtitle\n' +
'   if theInformativeText is not missing value then set notifyParameters to notifyParameters & " -informativeText " & quoted form of theInformativeText\n' +
'   do shell script quoted form of usernotificationCLIPath & notifyParameters\n' +
'end notify\n' +

'on notifyAsProTools(theTitle, theSubtitle, theInformativeText)\n' +
'   notify(theTitle, theSubtitle, theInformativeText, "com.Avid.ProTools")\n' +
'end notifyAsProTools'
});

else
  sf.system.execAppleScript({

// Notification via AppleScript and UserNotification CLI
script: 'property usernotificationCLIPath : missing value\n' +
'set usernotificationCLIPath to POSIX path of "/usr/local/bin/usernotification"\n' +

'activate application "System Events"\n' +
'tell application "System Events"\n' +
'   using terms from application "Pro Tools"\n' +
'       my notifyAsProTools("MxPrint", "Track now record enabled", missing value)\n' +
'   end using terms from\n' +
'end tell\n' +

'activate application "Pro Tools"\n' +

'on notify(theTitle, theSubtitle, theInformativeText, theIdentifier)\n' +
'   set notifyParameters to ""\n' +
'   if theIdentifier is not missing value then set notifyParameters to notifyParameters & " -identifier " & theIdentifier\n' +
'   if theTitle is not missing value then set notifyParameters to notifyParameters & " -title " & quoted form of theTitle\n' +
'   if theSubtitle is not missing value then set notifyParameters to notifyParameters & " -subtitle " & quoted form of theSubtitle\n' +
'   if theInformativeText is not missing value then set notifyParameters to notifyParameters & " -informativeText " & quoted form of theInformativeText\n' +
'   do shell script quoted form of usernotificationCLIPath & notifyParameters\n' +
'end notify\n' +

'on notifyAsProTools(theTitle, theSubtitle, theInformativeText)\n' +
'   notify(theTitle, theSubtitle, theInformativeText, "com.Avid.ProTools")\n' +
'end notifyAsProTools'
});

Is there a way to use the variables and handlers just once?
And yes, I am aware I can use the log function but that doesn't display the PT icon in the Notification. I tried half a dozen of things and the above code is the only method to make it work. But its cumbersome.