Slightly off thread but
1 there is no such thing as a quick conversion - at least not in the UK
2 this is IMHO not a good fit. The medical seats offer no support, the right hand attendant cant reach either patient or equipment, and the left hand attendant cant manage the patient's airway from that position.
In the 355 the stretcher can be mounted forward and still hold a 6ft 2 inch patient with the attendant at the patients head, equipment in the middle and on a flying bedstead, and two proper seats.