Powerlines can be great locations for food plots. We have a large TVA line going through our place and have several plot areas....I agree wheat and crimson clover would be a great fall planting that will green up nice.
But don't underestimate the native vegetation you already have....you have a tractor and bush hog so your we'll on your way.....find the natural travel corridors the deer are using and plan your bush hogging in those areas....bush hog lanes or strips this summer and the native grasses will green up and put on new growth... the deer will love it.....and then pick some spots to disk for wheat and clover as well.
By doing your wheat/clover plot....plus some bush hogged strips for new growth....then leave plenty of it just as it is today....by doing this your creating diversity.....we've done this in several areas on our place and the deer will use it....food, cover and easy travel routes through the thick growth.....and other than tractor fuel and some seed it's not so expensive.
And while soil sample, lime and fertilizer is a huge benefit....you can bush hog now, let it green up then spray it...once it's killed out sow it heavy with wheat and it will green up nice.....but disking to expose more dirt certainly wouldn't hurt.