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Metal film should be OK in that position. The modern choice to replace composition resistors is metal oxide. Looking at a modern resistor it can be quite hard to tell the difference between oxide and film. if you can see the spiral under the glaze it's definitely film but you can't always see that.
The place where composition really worked well was surge limiters in, for example, the anodes of HT rectifiers. Now you'd use oxide or wirewound.
On a related point the surge limiters in series with rectifiers need to have a rather higher power rating than you might think. They're not only carrying the DC current but also the ripple current.
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