You remind me of me. lol. Like you I enjoy the hunt and anticipation of pulling the trigger, but not seeing animals suffer. Sometimes I wonder what happened to me from when I was a kid and had pet Gerbils, mice, and hamsters. lol.
I planned the hunt 20 years ago but never went. During those 20 years I enjoyed having dedicated PD rifles custom built for the dream hunt. If I never get to go it's OK anyway, as I have enjoyed handloading accurate loads and using the rifles for target shooting at the 100 yard range. My planned PD hunting was to start with a 20Tactical (similar to a .20 cal 223)for inside 200 yards, a 22x47Lapua (similar to a 22-250) for inside 350 yards, and a 6.5 Creed for beyond 300 yards. The 20tac & 22x47L have lead weight I've placed in the butt stock and weigh 11lbs & 14bs. Shots with those two rifles can be seen at 100 yards as I've tested them with water balloons. All have 6x24x Scopes w/side focus. If you want to use the standard weight 223 rifle of about 8lbs or so with the scope, I'd seriously consider having a muzzle-brake installed so you can be assured to see the hits at 100 yards.
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My 11lb 20Tactical at top, 6.5CM at middle, 14lb 22x47Lapua at bottom