IMO, not worth the weight. I own several RWS break barrels (rifle, short rifle, pistol) and have taken small game with the long arms and once backpacked with a Crossman 22 pump pistol, taking many stupid rabbits for the pot. More powerful than your P-23, but it was marginal; the RWS rifles are far more capable. But they are big and heavy.
I have an old Sheridan 5mm - rebuilt once for me in the late 1960s. It is quite a small game taker, and there are a number of folks who backpack with tuned up versions of these (now owned by Benjamin). It's fairly noisy compared to the spring guns, but much more packable. I've easily taken game as large as woodchucks and raccoons with one shot using the Sheridan. Never mind all the charts and so forth - the Sheridan kills headshot dead-dead-dead using original style pellets - much better than my hopped-up 177. (Note: Woodchucks are good to eat; I don't care much for raccoon, although diet has a huge impact on how they taste - both theirs and mine)
If size matters, put a pistol in your BoB. I've taken a fair amount of small game with a Ruger 22 (my dad's) but like my Ruger stainless 22/45 better (and shoot it better). By far I've taken the most small game with a hot loaded 45 Colt Ruger Blackhawk, though - I mean, a lot!
Hard to beat a 22 long rifle in a pistol or carbine if you can shoot it well. Ammo is cheap and relatively compact and light weight.
My 2 cents.
Tom