Just a quick follow up on this.
There is a stable version of the assets publisher now. I haven't released the gem version yet, but you can use it with
gem 'lotus-assets-publisher', :git => "https://github.com/cabeza-de-termo/lotus-assets-publisher", :branch => "v1.1.0-dev"
It let's you compile the assets by invoking a configurable command line, so you could call compass command line from your Lotus app. The documentation is in https://github.com/cabeza-de-termo/lotus-assets-publisher/tree/v1.1.0-dev