Well, while it seems to be possible to install some old ruby/rubygems .ipks on the Lan Turtle, of course even if they were compatible with BetterCap, it would never fit on the tiny device. I should have thought of that.
Would it be possible somehow to install RubyGems on the Lan Turtle?
Being able to use Bettercap would be immensely powerful!
(https://www.bettercap.org/)