The 90 degree bent hose from the waterpump to the thermostat sprung a leak, so needs replacement. Nobody around here has one, and it'll take BMA several days to send me a replacement. What to do in the meantime?

As it happens, the lower rad hose has a 90 degree bend, and I'd saved one from the last waterpump job, as a spare. Properly cut with fishing knife, it is a pretty good fit pending a new, proper hose. Not perfect, but pretty good.