here you go - the paste-only function. i have not tested extensively and also you might need to change the delay period (commented) as to the speed of your keyboard/PC.
;PlainPaste-mod.ahk
; Press Ctrl-V once to paste regularly, or twice fast to paste as text.
; Modded to be included as part of larger scripts
;Skrommel @2006
SetBatchLines,-1
pastecounter=0
delay=333 ;change if necessary
$^v::
pastecounter+=1
SetTimer,PASTETWICE,%delay%
Return
PASTETWICE:
SetTimer,PASTETWICE,Off
wholeclipboard:=ClipboardAll
If pastecounter>1
Clipboard=%Clipboard%
pastecounter=0
Send,^v
Clipboard:=wholeclipboard
Return