On a Scale of 1 to 100 - How Difficult to Add Spaced Repetition Add-on to Word

Just for speculation: how hard do you think it would be / massivity of a coding job to create spaced repetition for...Word?

So that, if you had 900 pages you could get them thrown at you randomly and then to disappear and pop up again days later based on some sort of response:

Easy - Medium - Difficult

I've got some LOVELY pages I've built.  Set all to about 4 x 6 size.

I prefer to use Word because it is easy to edit.

But, them being all in sequence allows me to cheat - like learning the lyrics to a song.

I know there are some "export" programs for popular flashcards - quizlet / memrise and many others.

But, once the content is on that platform it can be hard to edit.

So, I guess my question is two-fold: is there anything ALREADY out there that can let me keep these pages in Word and see them as flashcards?

But, more to the point - in your technical opinion, in terms of coding - what kind of a job would that be for an add-on for word?

For what it's worth all the card right now are in pairs.  Something like.

1: H2SO4
2: Sulfuric acid
3: 1653-1658
4: Oliver Cromwell
5:This royal throne of kings, this sceptred isle,
This earth of majesty, this seat of Mars,
This other Eden, demi-paradise,
6: This fortress built by Nature for herself
Against infection and the hand of war,
This happy breed of men, this little world,
This precious stone set in the silver sea,

Sincerely,

OT