The difficulty is that there isn't a simple and easy solution for you.

Using a Mac means you don't have the same options of monitoring programs as a Windows user and using the HH2 complicates things further due to its unorthadox method of autentication.

It likely is possible to do what you want, but will involve considerable complexity
e.g. installing WINE or using Bootcamp to allow use of Windows programs on a Mac, then tweaking the programs to overcome the HH2 issues.

IMHO, it just wouldn't be worth the pain and frustration of going down this route if you are not comfortable with computers and have some experience of script writing/tweaking.

If you really want to be able to monitor and graph your DSL performance, it will be far easier to get an old (second hand, cheap?) Windows machine and a different router, so you can run RS/RSL easily.

Certainly not the most financially economical solution, but in terms of frustration and hair loss, with be far less troublesome.

It's really up to you which path - if any - you choose to take.