If you know how to splice, you can make whoopie slings with a fixed eye long enough to replace the stock HH suspension. Here is a video
about how to swap out the stock suspension for whoopies. Doing this will and using a MSH for the webbing using a trail stick will give you the lightest possible suspension.
For tarp set up, I'd consider setting up the tarp separately. First, since you are in a wet environment, I would think it useful to be able to set a a tarp first to have a dry place to set up your hammock and keep your gear dry. Second, I think you can get more taut pitch which is better to protect you in a wet environment IMO.