I do not think this agreement is 'non-standard'. Certainly not at this level. If I would play with a random expert that I had not played with before I would think this double to ask for another lead (actually I would assume it asks for a heart lead, similar to ...
An alternative counter intuitive play would be the heart jack at trick 4 retaining the queen in hand. Making an overtrick if west is 3-2-6-2 and unless I missed something breaking even against the rest.