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If you can afford your own gear, take it. You know the history and it fits. I,ve seen too many people wear BCDs too big because that is all that was left.
It appears that you are asking two questions: 1. Given that I dive a couple of times a year, does it make sense to buy my own equipment, and 2. Is traveling with my own gear challenging / awkward / difficult?
I think you see the consensus among the responses regarding travelling with gear - it really isn't a big deal. I travel to the Caribbean a couple of times a year, take my own gear (regs, BP/W, weight belt, wetsuit, boots, fins, camera, small Save-A--Dive kit with tools, camera, etc. - essentially everything minus cylinders / weights) and I have never had to pay any extra baggage fees, nor have I ever had to rent gear locally because of lost luggage.
Therefore I would encourage you to NOT base a decision about purchasing gear on potential hassles of traveling with it. The cost of annual (or biennial, for a lot of gear now) service is a consideration, but not an imposing one. You apparently don't plan to dive locally (cold water), but you seem to dive with some intensity, albeit episodically. Decide if you are comfortable with rental gear or not.