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Thanks Alistair. A fuse is failsafe, although I was looking for a more elegant solution, such as current regulation with ripple reduction. Working around a less than ideal power supply. I have used cheaper versions of the 78xx pin compatible regulators.
The failsafe option is easier, providing SMPS ripple is very low. Virtually all adapters are SMPS with ? ripple anyway. Noise reduction has been a major goal.
I'm pretty tired of working around the limitations of the power supply. Now looking at a laboratory spec unit. Time is money as they say and I have been saving for some more gear, so a good SMPS will make a huge difference and simplify things enormously and provide more flexibility.
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