I'm getting Access Denied on your link...it's #23, mustard yellow, p. 82.
My brain is aching with information overload! As notification of your post arrived, I was watching the cast-on videos at knittinghelp.
Last night I tried the (CO 1, K1; CO 1, P1) thing...total flop...probably mostly me since I was using the Backward Loop method.
It's confirmed -- I hate that method, and for exactly the reason you mention. Time to expand my casting-on horizons....
Thank you so very much...I was suspecting the Knit-On method looked appropriate for this but wasn't sure. The straps are becoming a "thing" and you've boosted my confidence and motivation enough for me to get back in there.
Thanks again, Renée :-)