Yes, Druk had ordered 2 and there were a good number of other possible customers and the number would have risen by now. Reason for non appearance of a 2 engined version looks like BAes under investment , same as led to the killing of the One- Eleven whose sales were latterly killed off by very low production rates in small batches. With a max production rate of 24 per year the 146/RJ suffered in the same way. Potential purchasers want to have an aircraft whose future support is guaranteed by there being large numbers around which keeps spares producers etc interested especially when it goes out of production.
An early problem with the 146 was that BAe didnt push it with large customers but sought wide geographical distribution with in small numbers. Any aircraft needs the big fleet orders to establish its market base.