The travel plate is a little floppy. Aluminum would be more stable and would only weight a couple of pounds more. That is probably a good trade-off. The 30# wing is not much bigger than the 18# wing and doesn’t weight much more either. If you intend to dive local, the 30# is going to work better for you.
Regulator weight is kind of like bicycle weight. You can pay $X for a very good bike or you can pay $10X (or $100X) for a world class bike. If you look at the titanium Atomic regs v. the bottom of the line Z2, you are looking at 3 or 4 times the cost for the exact same performance. If you have the disposable income, knock yourself out.
If your local diving is in cold water, I would probably spend my money on a SS plate, the larger wing, a good diaphragm reg like an SP MK17 and a drysuit. So that is a several thousand $ upgrade package and not too travel friendly. You could always leave the drysuit at home and the rest would be fine for travel. You might not have much ditchable weight with a steel plate but that doesn’t bother a lot of folks. This would bump your travel weight up about 8 or 10 pounds.
Also, the amount of weight you need is the amount of weight you need. No one but you can really determine if is is too much or too little unless you are floating back to the surface or plowing through the water, feet down, and roto-tilling the bottom. Then everyone can tell you’re off.