Our boat, Makai, carries the ICOM 802. As stated above opening the radio to the ham bands is very easy. If it a new radio it may come already programmed to tx on all Marine and Ham bands. Though illegal most of the cruising boats we knew used ham radios as they are generally more than half the price of the i700 or i802. Even at discount the 802 is $1,700.
802 is an easy radio to use but after 3 years in the Caribe I only met one other boat who had dsc capability actually had it setup and that was on marine VHF. We set it up to play with; the functionality has other excellent features in crowded areas. Most of the boats do not have it available and don't use it if they do. The issue is 2182 is short range and you would almost have to on top of another boat to pick it up. Most of the places we cruised no one even used that area of the Marine bands because of the distances.
The second issue with DSC HF as well as VHF is a lot of commercial ships may be required to monitor doesn't mean they are actually doing it. We had many encounters with ships traveling north on the Gulf Stream from Bahamas to SC and in the Caribbean Sea. Because small boats sometimes don't provide a good radar return we would try to contact the ships to determine intentions and only a few times did we ever get a response.
I believe the CG doesn’t monitor 2182 in most or all areas and definitely not outside of the US.
I am not saying don't program it in and make placard showing the steps, but also learn and setup other operating freq where people are known to congregate (like 8104 Marine HF in the Caribe) to ensure you have the best chance to get another station in an emergency.
On our next trip out I am adding a dedicated HAM all band radio like the icom 7000(which can still tx on marine HF in an emergency). One for redundancy and two the ham radios are easier to fine tune.