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That sounds like a good idea, but I haven’t worked in plaster I decades. I did a search on “how to repair a plaster sculpture” and found this video: https://www.bing.com/videos/search?q=how+to+repair+a+plaster+sculpture&&view=detail&mid=F8F24DDB38AC816BBE3EF8F24DDB38AC816BBE3E&FORM=VRDGAR There are several others as well. Hope this helps!
As far as supporting it with something behind the leg, like you show in the link, that would be difficult to not look like an add on, especially with using a different material in contrast with the aged plaster.
Since it has a good armature inside, you could simple repair the crack line at the ankle and hopefully you won’t have any more stress cracks. Usually those develop with moving the sculpture. So, if you don’t move it, then maybe the repair will do the job.
Lay sculpture on it’s back on some foam or old pillow. Get crackline very moist. Liquify/make runny some plaster and let that flow deep into the crack line. If the line is a big enough crack, use a needle tool to press the plaster into the crack and pack it in. Use a damp finger to smooth over the crack line to flush it out with the surface. When nearly dry or dry, use a fine 600 grit sandpaper (one that won’t leave residue and discolor the plaster) to make smooth. Finish out with 1200 grit. Allow all to set for one day before carefully setting sculpture back in place on his feet.
Hope you figure out something wonderful for your plaster sculpture to preserve it.
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