I think its relevant to actually look at the old property, Irving setup a drywall facility/other over top of the old property (alongside other businesses) and all of the actual shipbuilding infrastructure has seemingly been sold off, destroyed or left to rot. The Koreans would need to tear down/convert the drywall facility (which we paid for Irving to set up through loans) and all other operators on the property before effectively rebuilding the yard off a foundation which has been left to rot since the early 2000's. I don't see it being a worthwhile or workable plan, it would entail and ungodly amount of effort and money when you could take either an active yard or a better foundation to start from instead.
Through some Googling and what I know already, I've found that Mersey Marine has two shipyards in Nova Scotia which both undertake regular repair work, Shelburne Ship Repair and Mersey Marine Limited in Liverpool, NS. These are both former Irving facilities that regularly taken on commercial contracts for ship repair and upkeep and in the case of Shelburne, still gets regular Government and Federal contracts even for small-mid sized vessels like CCG icebreakers (CCGS Kopit Hopson 1752 & CCGS Earl Grey stick out as larger vessels), utility ships, Navy auxiliaries and MCDV's. These are proven facilities with track records, existing infrastructure (large vessel lifts, paint shops, fabrication, welding, electrical, etc) and a current workforce that can be built upon by a larger company, with a lot of funding heft to throw around. As they aren't owned by large shipbuilders like Irving, you can more easily purchase them and enlarge the facilities without as much trouble.
Both Liverpool and Shelburne have ice free year long access to the Atlantic Ocean through natural ports and are present down the coast from Halifax a reasonable distance. The Liverpool yard is a bit constrained and located directly within the town itself, while the Shelburne yard looks to be some distance from the town proper with plenty of space to expand.
Mersey Marine Limited (formerly STENPRO) services include a comprehensive ship repair, fabrication and maintenance services including hull repairs, engine overhauls, electrical and mechanical work, as well as blasting and painting.
merseymarine.ca
shelburneshiprepair.ca