Uh, have you thought that one entirely though, Mac? I don't think the Arrow is big enough for that job, myself. My idea of a long-lasting Arrow variant is to make it into a multirole aircraft, a delta-wing F-4, if you will. I'm envisioning the first Arrows entering RCAF service in 1961-62, which works great in the interceptor role. Later on, the company decides it will have difficulty selling straight interceptors, so it develops a version with bigger wings, leading edge extensions and other lift-enhancing features, more powerful engines, new avionics and weapons systems and external hardpoints, allowing the thing to carry more ordinance. This variant would be bought by the RCAF to replace some of its CF-101s and provide multi-role capability. Some of these replace existing Arrows, most don't. Many are sold here, as Canada has few qualms about selling to countries it can deal with.
Unfortunately, I don't think that the Arrow would have made a very good multirole aircraft - a bloody brilliant interceptor with almost no match (at least not in the East) it simply does not have adaptability to be anything else because:
1. Not enough range - the engines are so fuel hungry that it maxed out at 410 miles. Not that any of this mattered in a short range interceptor. Doesn't have the range to be anything else.
2. It's structure is unlikley to be able to cope with the stress and would require major internal redesign. The wings weren't even strong enough to support external fuel tanks.
However, what the Avro Arrow would be good at, and allow it to perhaps remain in service well into the early 21st century would be as a high altitude recon aircraft. Remove all of the weapon systems and replace with photography and extra fuel tanks. Upgrade the engines (perhaps RR Olypus' as in the TSR-2) and that could, with external tanks perhaps reach a radius of 3000 or so miles. So, in ALT 2006, instead of the RAF retiring it's last two Canberra recon aircraft, it could instead be it's last two Avro Arrows?
Russell