Not sure why I didn't, but seems I forgot to link to my playlist of video solutions for the Old Formats NL version of Lemmings Stampede when I posted my replays!
Well, here it is 
https://www.youtube.com/playlist?list=PLbp2m4KlFpJtK-BF8h7doLwbeMFl47cm_
Well, here it is 
https://www.youtube.com/playlist?list=PLbp2m4KlFpJtK-BF8h7doLwbeMFl47cm_
Similarly with providing extra skills to act as red herrings, though this is harder to do since one must take care to make sure they also can't be used to backroute the level. The most common one you probably have seen is providing bombers on save all levels, though there are such levels out there that still require them to be used. Hence, in pickup levels, it very much becomes a puzzle and you'll need to ask yourself, what pickups do I need to solve the level, are these pickups necessary to solve the level, etc.
That's what I get for keeping all replays, including the old ones. I've fixed it now, so the new attachment in reply #53 a few posts above should be correct
However, as it turns out I really overcomplicated my solution compared to the intended way!
I was definitely wondering about that and I simply failed to figure out its meaning
Looks like I have a 'new' pack to play!