When you say that you don't have a budget does this mean no expense spared, or you haven't money put aside for the tyres?
If the latter then why don't you fit top quality part- used tyres, they are usually imported from Germany, where the tred limit is 5, & not 1.6. Another german law demands that two new tyres have to be fitted on an axle, so, for example, if a side wall is damaged on one tyre then two new tyres have to be fitted (Expensive!!) even if the undamaged tyre is pract. brand new. Some times you can get 4 almost new tyres for a fraction of the price. Many taxi drivers do this, I am sure you will be able to find a tyre depot that supply these locally.
Throw only toilet paper at the W.C. anything other may cause a breakage to the engine. Grazie (Roma 1990)