Before I spout off, my opinions are based on many years experience with our departments tech rescue
team and involvement with Chaffee County SAR.
The rolling hitch was never intended for fall protection/life safety. It may work, but it may not. It will be difficult to maintain the knot
integrity while sliding it up the host rope
. A prusik is what you want to use.
The British Columbia
Council on Tech Rescue
did extensive testing on systems, knots and equipment
. The only recommendation they have is the prusik. Prusiks are cheap and have many uses. Of course there are many mechanical devices out there that do the same thing, just for a lot more $$$$.
Check out Animated Knots by Grog
notice the recommended uses for the knots we're discussing. That site also does a decent job of describing how to tie them. Prusik size, diameter, is critical. Too large and the prusik will not grab the host rope. Too small and it will grip like hell and be difficult to undo and slide. Figure about 70-80 % of the host rope. For example a 10mm host rope would require a 7-8mm prusik.
Yes there is more than one way to skin a cat, but if my butt is hanging on a line it will be hanging on the RIGHT knot
And like viking sailor said mast steps are great. If you aren't totally confidant climbing a rope don't. You can get hurt real bad.