Technically it shouldn't
Roadworthy certs are to filter out cars with serious defects from being sold to other people such as rust, worn seatbelts, tyres, low brake pads etc. on the RWC there are basic sections for tyres, brake effectiveness, windscreen, etc. I doubt you'd find a section for aftermarket mods or non std items.
On my last RWC it failed (the car I brought) due to tyres and worn steering wheel. Mind you that was a shitty ba wagon.
You should be fine