The V plate sounds interesting, any published info on it's use with stroke patients around?
Back to this patient. Stroke patients do not always get anywhere fast! Keep cool about "nothing is working". You cannot work miracles in one month. How often can you treat in a week? how long at a time? The relatives wishes are valid. But often unrealistic. If the wish and long term goal for them is walking, OK. Accept it. But you are the expert as far as therapie goes. Do standing, weightbearing, but explain as good as they can understand that you have to improve other functions in order to help the patient on the way. We know a quick fix is not possible.
I don't know how old the patient is. If joints are stiff, you might be able to improve it or maintain it. Be realistic. Careful manual work on joints and soft tissue is not totally forbidden in stroke patients but I don't have the patient infront of me to suggest in detail. (does he have anticoagulant medication?)
What is the UpperExtremity weightbearing stretch position? If functional activie movement is not possible, and some maximally assisted/passive movement combinations are, then do them and encourage the patient to look at the hand and arm moving. Arms are not just for weightbearing in every day. They are used to express oneself, take and hold and give things. Put some really interesting thing in front of him and motivate him to reach it with your help. Assist lead his arm and hand, if at all possible if hypertonus allows, towards the object, try and get him to get there at the 2nd or 3rd attempt. This would include some trunk participation maybe. Short distance, small achievment. Yes of course scapula awareness is also useful. Proximal positioning is needed for distal precision work. (I know this person can't ) Mobilize for example by reaching with your hands around the sitting patients upper body, one hand ventrally other dorsal approx under the armpit to elevate the shoulder girdle (sorry impossible to explain in short) incl. scapula with either emphasis on pectoralis or lat dorsi soft tissue mobs. If you don't have much time to treat, I would suggest leaving out the electrostimulation and do more active-assisted/ movement facilitation. It may be usual to do it in your country, but I'm convinced active hands on movement brings more. We don't do any here in the Wikipedia reference-linkBobath courses. We often do not get anyway near perfect movement in longstanding strokes. Often we have to accept the hyperextension trick movement without proper quads in the knee, if it allows a way of walking at home that relatives can deal with and it makes the quality of life and managment better. Not ideal but thats life as a physio.
Keep on trying, you have done lots of homework on this one. You should see some progress sometime.