temporary inclusion of a read-only file / inline element into orgmode buffer

[HJ]

  Hello,

   I was wondering whether anyone here knows how to effect a temporary 
inclusion of a file into an org file. What I mean:

   I would like to use orgmode to keep a documentation / devops 
document. That document will contain commands ( with lots of 
start_src...end_src...results blocks), where such commands usually 
produce small results (20-60 lines), which are to be included inside the 
document. But, on occasion, the command will produce 2,000,000+ lines of 
output. Practically this is a difference that requires a different 
storage approach, yet semantically inside orgmode I would like to 
experience as little difference as possible.

  The question is whether anyone knows of a way to keep the small 
outputs "inline", but have the option of automagically store the large 
output inside a separate file (this file may be treated as a read-only 
file), but still be able to operate on it as if it was not an external 
file but an part of the current org file. Perhaps based on a toggle 
command, one could say "include all "external" files inside for a minute 
while I make my searches, and then purge the read-only "external" files 
out of current buffer to keep emacs small and speedy.

  This might be similar in concept to "inline images" - they are a 
display of read-only file into portion of the buffer - except that no 
searches and other text operations can be performed on it.

  Related question: Imagine you are browsing a document which contains 
an headline with an inline element (like an image or said large number 
of output lines) which is expensive to obtain and display. Is there a 
way to say to emacs to delay the loading of this expensive / huge 
resource until e.g. 5 seconds passes or I press F6 or something to 
indicate that I am willing to pay (money, time, memory resources) to 
have the inline item displayer?

  Any ideas or pointers please?

   Thank you!!

   - HJ

PS: I dare not ask whether such dynamic  inclusion / exclusion could be 
performed on a read-write file as well, but if anyone dares to venture 
out on this question, it would be most welcome. This could expand (my) 
horizons of orgmode's usability!