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You can, but I think you'd be fine in a $50 skin, with 8# less lead. If I am wrong, rent a shorty to wear over it there. As you decide what kind of diving you are going to do locally, then select that suit later.Why can't I just take a 5mil to Mexico and if I get warm I can just open the collar and let some water run in? At 300-500$ per wet suit, I'm not looking to spur a private collection.
Good for you on the weight loss. Since you're planning on shedding more pounds, then don't go out and spend 300 USD on a wetsuit : those are even more unforgiving than vest style BCDs (Anyone interested in an almost brand new XS Cressi 7 mm ? The stupid thing has "shrunk" so badly I can't even pull it up past my knees… )
Honestly, I find the set up a bit expensive. Halcyon is a reknowned, reputable brand, but if I were you, I'd get a cheaper BP&W set up with a 30lb wing, and then invest in a bigger wing when the need arises. The padded shoulders and Cinch harness seem like a good idea on paper, but I think they're more of a marketing gimmick. I was afraid when I bought my set up that the harness would be uncomfortable as it is just webbing or that I would have trouble donning my kit as there are no buckles for a quick adjust. Was happy to find out that it was a non-issue.