Kaian, there is a very simple solution to your problem, earn more money?
Only Joking, get a spare second hand back wheel, it shouldn't cost you a fortune either.
Put on a green tyre (these are solid, like a big plastic hoop, no pump up, type tyres) they should be available from the bike store and they are relatively cheap and last a long time too.
Fit it to the spare wheel and just get stuck into riding. You will of course find it is harder to push with that type of tyre because they roll with more resistance or drag. If you ride them on the road they definitely drag and it makes you work harder, it also feels like your riding on a flat all the time and it's harder on the bum too. You'll need to have a good saddle or extra padded chamios.
By getting the added advantage of having to work harder, the result when you get back on ther road are quite surprising, you will be that much fitter, I kid you not.
The only down side of a wind trainer is the boredom of sitting staring at the same bit of road or carpet all the time, so get set up in front of the TV get a good video of the "Le Tour" to watch while your training, see if you can match it with Richard Virenque when he's climbing in the alps?
Then you'll kick **** big time when you get on the road?
Just do it, don't look back unless, it's to see who you dropped on the last mountain. TBC