NQY-MAN - has previously operated 2&3 daily but via BRS and with the ex PLH etc with SZ.
Also WW previously operated 4 or 5 daily on 737s during summer so it's possible that MAN could support a twice daily Q400.
How are the loads on the route ?
NQY-EMA, NQY-LBA , NQY-DUB Are all ex SZ/WW routes that operated for years so there's potential for those also.
Obviously I don't know loads & yields etc
SOU is an interesting one, due to the number of onward routes offered if marketed correctly it could work, for example it would if timed well open up JER, ALC, BCN etc.
Same applies to MAN but marketing for this would be the key
cs