bluepill_override.rb

class BluepillOverride
  def self.provider
    Class.new(Chef::Provider::BluepillService) do
      def shell_out!(*args)
        args.each do |command|
          rvm_shell "#{command}" do
            code command
          end
        end
      end
    end
  end
end

cookbook.rb

bluepill_service 'my-service' do
  provider BluepillOverride.provider
  action [:enable, :load, :start]
end