B-70 seemed well suited for its job in light of the Vietnam War. High altitude high supersonic aircraft have an unfortunately undeserved reputation in popular discourse, given the cumulative effects of speed, altitude, ECM, maneuvering, and RCS are better understood now, and speed tends to be similar to stealth in that both greatly reduce launch windows at high altitude. Though, by the time the electronics had caught up to the needs of aircraft (about the 1980s I suppose?), VLO had already had lots of resources expended on it. B-2 was being developed, F-117 had been done and did, and high supersonics still had unsolved questions like skin heating that would need to be addressed from the start before serious development could begin. Compounding that, I guess you'd also have to develop new weapons designed for release at high Mach and high altitude, and it is overall a more high risk development compared to the pretty staid ATB, without much advantages beyond being baller.
It certainly wouldn't be subtle, though, but the reliance on radar for interception (between the high Mach needed at sea level and the aerodynamic heating of the target, making an infrared transparent window that could survive without being destroyed and a seeker which could discriminate the B-70's hot airframe from the surrounding supersonic air would be a feat; I think this is what ultimately killed Pye Wacket). The aircraft could probably plot and avoid optimal missile engagement windows being detected/calculated on-the-fly. I believe similar avionics exist for the F-22 and B-2, although it is geared towards avoiding detection altogether.
The best armament for such a plane would probably be some sort of hypersonic or supersonic nuclear missile, similar to SRAM. Something that would allow you to avoid flying directly over targets, basically, to further reduce engagement time/window. I think this was considered for B-70 (not SRAM, but a notional small, supersonic missile), but I don't have a source to back that up at the moment.
SAC's 1980s bomber fleet could have been very different from what it turned out to be, though. More spacesuits and anti-flash paint would be involved, I suppose, and bigger engines. Some sort of evolved high supersonic penetrator would also be an interesting weapon from the perspective of a global policeman, mostly because of its faster response time compared to a VLO subsonic penetrator.
But jeez, now it's starting to sound like TBO or something and no, I've never read any of Stuart Slade's books.