Hi! First off, after reading about the Asian Toad, I agree with you, this species sounds very interesting! However, this toad, according to Wikipedia and other resources can grow up to 20 cm in length, which means unfortunately your vivarium will be much too small for a toad this size. Toads are more active than Pacman frogs, much more in my experience. They are really fun pets though. A 35x35x40 cm tank is around 49 liters according to a calculator I used online. I would suggest at least 100 liters of space for a toad that size, maybe a bit more. As for UV lighting, I've found that d3+calcium powder and/or gut loading work great, so I wouldn't worry too much about getting a UV bulb. To ensure you don't give too much or too little d3 and calcium there are dusting schedules stickied in the feeder section, they can be very helpful.
Sorry for any inconsistencies in measurements, I'm not familiar with the metric system, so I had to plug things into a converter online. Hopefully this helps.