Sounds like reasonable choice! I agree that strobes wouldn't add much, other than weight and cost. Adding a little light to fill in shadows should do it.
As for which dome, I think the bigger question is whether Ikelite has extension rings for those lenses. The actual dome size is probably neither here nor there for this type of shooting, but which dome is paired with the lens is critical to avoid distortion or "dome cropping".
Presumably Ikelite has a compatibility chart available which should guide you.
Oh, by the way, (and I think I speak for everyone who reads your post).... it's not fair to call anything you do in that location, "work". Just sayin'...;-)