surely with it being lit up you wouldnt need a high ISO anyway. That lens is relatively slow particularly at its longer length. Your camera has a very good sensor, and controls noise very well, have faith in it.
I would suggest though to experiment with a shorter faster lens, then cropping in the edit. Try this with centre weighted metering (if using manual, take a spot reading from an area between two lights).
I get your point though. Ask the camera shop if you can try a ball head on a monopod, particularly one with a friction control.
THIS is what I use on my triopd (
Giottos) It has a friction control that is very useful to allow a bit of movement whilst reatining a bit of stability.
I have an older version of
THIS on basic Manfrotto monopod, which is what I would use for moving subjects and airshows etc. The tripod is just too cumbersome and restrictive for airshows (imagine a plane moving horizontally, then suddenly increases altitude or loses it). Without the ball head on a monopod, and the movement of your subject changes vertically, you run the risk of hitting a person standing in from of you as you follow the subject up lol
(I still do this even with the head fitted!
).
For comfort too, try to get a monopod, or tripod at least capable of being as tall as yourself, if you are planning to shoot upwards whilst standing.