The can is grounded and supposedly prevents signal contamination from stray emf/radio noise. You can accomplish the same using mu-metal shielding around your connections and eliminate the can.
I did a search and noticed that mu-metal shielding foil costs around $3.79 per inch depending of its thickness.
That would not be a problem for but how do I choose thickness and how do I apply it around the connections?
Example, MuMETAL® Foil .002" Thick X 8" Wide - 1ft $28.94
There is .004", .006", .008", .010", etc.