The other problem you face is that single engine jobs are usually single crew and whilst I can't be 100% sure I believe that in order to operate commercially single crew I think you need 700 hours total time (maybe also 100 hours IFR?). I might not be totally correct with regards to this requirement but I'm sure someone on here will be able to correct me.
From:
Civil Aviation Rules
Part 135, Amendment 17
Air Operations – Helicopters and Small Aeroplanes
(2007, I don't know if this is up to date but this is all I could find.)
135.509 Experience requirements for IFR pilots
A holder of an air operator certificate must not designate a person as pilot-in-command of an aircraft performing an air operation under IFR under the authority of the certificate, unless the person—
(1)
has at least 750 hours of flight time as a pilot, including 150 hours of cross-country flight time which must include at least 50 hours cross-country flight time conducted under an IFR flight plan; and
(2)
50 hours of actual or simulated instrument time of which 25 hours may be in a flight simulator approved for this purpose; and
(3)
for night operations, 25 hours of night flight time.