You do realize, don't you, that unless you're exceptionally fast, even your 1 km efforts are predominantly
aerobic in nature, and thus like probably 95+% of training that people usually do, serves to raise your functional threshold power? (That's especially true if you do more than just a few efforts, and/or allow only a few min of recovery in between them.)
If you want to do some true level 6/level 7 training, here's a workout you might try:
1) using an 86"-88" gear, warm up in a paceline, gradually building the intensity up to race pace (~20 min);
2) get off your bike, drink some water, stretch a little, and put on a 92"-94" gear (~15 min);
3) do an all-put 500 m effort from a standing start (~40 s);
4) roll around the track a few times, then get off, drink some more, stretch a little, then get back on the track and do a few more easy laps (~20 min);
5) repeat steps #3 and #4 three more times;
6) go home.
Congratulations...now you
really know what anaerobic training is like!