Captain Cop,
The issue of whether or not an aircraft is fitted with FADEC or not is not really an accessory or delete option for the operator - it is an essential element in the very guts of the aircraft and its certification. The EC 145 is, in terms of its certification, a BK117 C2 - a development of the BK117. It is not a new type, like the EC135.
The AS355N was a very quick aircraft to start and get airborne in the police role - probably the quickest. The FADEC checks happen in a few seconds. By comparison, the FADEC checks on the EC135 take a little longer. The earlier EC135s just had the FADEC delay, which occurred before engine start. However, on the later EC135s, there is another delay after start, whilst the glass cockpit displays and all the SPIFR gubbins checks itself. This is the MEGHAS referred to earlier.
I guess that the manual engine start on the EC145/BK117C2 will be fairly quick, but they may need to wait for the MEGHAS after start, like the EC135. CPDS.