The guest-inspired solution unfortunately didn't lead me anywhere. But it did somehow got my brain juice flowing enough that I finally found something that works! B)
Wild 15: lose 2 (48/50, 96%)
This solution ends up being a modification of my earlier 47/50 solution. Notably, it uses a glitch, whereas the guest-inspired 47/50 solution is glitch-free. The 48/50 adds another glitch.
The glitch for my non-guest 47/50 is an old one that's well known before I even came to this forum. The 48/50 glitch is one that I knew about for some time, but I guess I either discovered it some time after my earlier tries of Wild 15, or that I never saw to use it on this level. It's arguably not necessarily a glitch, but nonetheless it's something I don't think anyone has yet ever thought about, or have used it to either solve or create a level with. Unfortunately, again I want to reserve this for my future purposes, so no more details on it for now. (Well ok, one hint: it's the interaction of 2 skills. The result is arguably completely in line with what the 2 skills usually do.)
Many thanks to guest. Without him, I would've all but forgotten this level. Want a hint on one of the other levels?