allruby script for Windows

allruby.cmd

@echo off
C:\opt\ruby\bin\ruby.exe -x %~f0 %*
goto :EOF

#!ruby
require "yaml"
cache = File.join(File.dirname(__FILE__), "allruby.cache")
if File.exist?(cache)
  rubies = YAML.load(File.read(cache))
else
  rubies = {}
end
changed = false
Dir.glob("C:/opt/*/bin/ruby.exe").each do |ruby|
  unless rubies.include?(ruby)
    rubies[ruby] = `#{ruby} -v`.chomp.chomp
    changed = true
  end
end
File.write(cache, rubies.to_yaml) if changed

rubies.sort_by{|_, v| v}.each do |ruby, _|
  puts rubies[ruby]
  system(ruby, *ARGV)
end

expects that all rubies are installed in C:/opt/* directory (like C:/opt/ruby-2.4.3), and there is "base ruby" in C:/opt/ruby.
Change line 2 and 14 for your environment.