Buy the ground stations for cheap, then buy a squadron's worth of MQ-4C Tritons (say 8 or so). Three each for Comox and Greenwood, with two rotating out for extended overhaul periods at any given time. Operators could be anywhere.
And keep the Euro model for spare parts.
Rough guess: the RCAF could do this for about $1.5B (acquisition); I have no idea what the operating costs would be, but I anticipate they would be lower than the equivalent YFR from an Aurora. (Not to say that these would replace Auroras - they would be complementary).