Better not because 235/45 is about 0.5cm taller sidewall than 225/45 so the back of the car will be even higher by about 0.5cm. My suggestion is stick with original 235/45/18 but try find more affordable option yet still very good, for example the newest Falken FK510, around rm550 as shown below:
https://www.mudah.my/235+45+18+FALKEN+AZENIS+FK510+JAPAN+new+tayar+baru-70699220.htm
Or else you can opt for 225/45/18 front and 245/40/18 rear which is also still cheaper than 235/45/18. 245/40/18 is only about 3mm lesser sidewall height compared to 225/45/18 so less obvious difference than 235/45/18. This is the most common staggered size used by the guys in the club. I myself is also considering to opt for this for my next change. The downside of it are:
- the ride comfort is lesser too
- your fender gap will increase (not an issue for lowered car).
- your handling might be more understeer
- your front tires will finish even faster than normal.
- cannot rotate front/rear.