Is is possible to add disc mounts to a steel frame and fork? or would everything blow up?
Highly inadvisable, the fork need to be extensively modified to cope with the force that's coming from the stay rather than the crown.
Your best bet really is to get a new disc fork, and modified the rear for disc.
The fork would be easier to replace outright, but the frame should be ok, as long as a reinforcing strut is fitted between the stays.
Or there's the neater ( imo ) option of placing the mount on the chainstay.
Best to let an experienced frame builder take a look at your frame and advise you.
@root started
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Is is possible to add disc mounts to a steel frame and fork? or would everything blow up?