Is this Java or SSJS?  In Java this is built into the editor that you can "Surround code" by right clicking on the context menu.

In designer there is also the ability to have "Snippets" though that might be Java only as well.

Honestly if you want to have a key stroke equal something like this, I likely just need a third party app.  There's a bunch out there and all they do is something like this.  People use them in Word processing for signatures and all that.  That's probably your best bet.

I just downloades AutoHotKey which really looks like overkill for what I need but appears to do what I need.

I try to set up Script blocks like this

try{

var debug:Boolean = false

}catch(e){

//My error trap

}

so I created this script for an <Alt><b>

!b::
send, try {{}`n
send,  `tvar debug:Boolean = false;`n
send, `n
send, `n
send, {}}catch(e){{}`n
send,  `tWFSUtils.sysOut("" {+} e.toString());`n`n
send, {}}`n
Return

works like a charm going to save a lot of time and spelling/case goofups.

Tried the <Alt><b> in here and the results are above, so key stroke must be unique, but you can set up pretty much any combination you want. <alt><b> is probably not a good choice probably will change that to <Ctrl><Alt><b> or something like that.