yes i believe is the same idea for spousal. you made excellent points. tyI’m not sure if it’s possible. Haven’t heard of that before.
As I had a completely different situation (Proving Common-law) I may not be the right person to advise you. So the thing is that when you appeal the negative decision you can provide supporting documents that weren’t included in the original application. It can be documents from three periods of time: before you applied, during the time of waiting on the decision and after refusal. At least this is how it works with CL. So if you think that at this very point you can provide enough proofs to support your case then it would be a good idea to appeal. But if you think that you don’t have enough evidence (such as recent visits, photos, money transfers, getting-to-know each other’s friends and family) I would suggest you go and get it and then reapply with a stronger case. IMO, so maybe people with similar to yours cases can be more useful.