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A steel rivnut, splined for preference, and a blob of epoxy should be fine. If you want a suitable rivnut, let me know. I have many.
Brommers-
Paging @mdcc_tester to tell you off about epoxying a rivnut.
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Rivnut doubly-secured with epoxy is how I've replaced bottle cage mounts in the past.
Got some spare alu M5 rivnuts I'd be happy to pop in the post.
@pastry_botEdit - just realised it's a steel frame so an alu rivnut may corrode
Tijmen
Harry 
Today I managed to fall into/onto a fallen tree branch - it was a pretty big tree - and the branch basically levered off the bottle cage and one of the mounts from the down tube. A bit of a bummer since this bike is only two or three months old.
Would it be possible to epoxy/glue/rivnut these back in or is it back to a framebuilder to torch the shit out of my almost brand new frame?
I should add, I'm not a framebuilder...