Great idea and really good quality shots!
Here's my suggestion of a cumbersome ghetto-tele-lens:
This is a russian Tair 3 MC 300/4.5 on a Kenko Teleplus MC7 (2xconverter).
This combo is a handful on any tripod (looks like a baseball bat), but really useable at f/5.6 (better than f/8) on a K100D. So you have a useable 600mm at f/11 which does work allright in daylight conditions. Both lens and converter are in the 10-X Euro category and that's why I thought they'd fit here :-)
All the best,
Georg (the other)