Update:

> DOSBox lacks an x86-to-PPC JIT compiler.

Apparently, such JIT compiler has been developed meanwhile and included in Linux and OSX builds:

https://www.vogons.org/viewtopic.php?f=32&t=65057
http://tenfourfox.blogspot.com/2019/12/and-now-for-something-completely.html
https://sourceforge.net/projects/dosbox-ppcjit/