Nope. I was afraid of that (mixing up the "copper braid" or "grounding strap" with "wide copper strap").
Wide copper strap is #1; use it when you can. If you can't, then either something like Rick's suggestion (multiple wires) or more common copper braid used for grounding would be OK, but not as good as the copper strap.
Best place to get copper is your local roofing store. It comes in all sizes, and you can get the thicker stuff which will last longer in the marine environment
The thru-hull should be sufficient, but tying in additional metal isn't a bad idea, so long as that metal isn't otherwise grounded to the DC system. Preferably, the thru-hull also should NOT be otherwise grounded to the DC system.