The problem with using a big, physical striker as a plan B is that the big physical striker needs to be quite good. Your touch needs to be on point and you're going to have to contend with being the most marked person in every aerial situation, because most others on your team are very short. According to me, Gomez right now isn't someone who would convert that rare chance that you get in the box; nor is he good enough with touch and quickness of thought.
Of course, a big tall striker who is good at these things - he isn't going to want to come or be available. Therein lies our conundrum. A traditional but average no 9 , IMO, is unlikely to work. Which is why I don't mind Persie, he's a bit different and could just work (Persie might spectacularly fail too, but I feel it has a higher chance of working out)