How difficult are the entry/exits? I understand you leave the main boat and use smaller pangas to get to the dive sites... .
The entries are not difficult at all since they are all backflips over the site. The exit depends upon the boat and the accessory craft they use. On
Mermaid I over Komodo (and it does RA too), they were standard dinghies with ladders. You kit up on the main boat and enter the dinghy with fins and mask. But if anyone has difficulties with that, I am sure that they crew will help.
For the exit, hand over the fins and then unclip the fully inflated BCD which is then pulled through. If you are using weight belts or integrals over 6 kilos (14 lb) the weights will also have to ne handed over first. After that, it is a relatively easy climb using the flipover steel ladder. When there are strong currents, the ladder can also be used to anchor yourself before removing funs and the kit.
Some liveaboard yachts use larger panga-like accessory boats (eg
MSV Seahorse, in which I went to RA) where there is enough room to kit-up on the smaller boat. The crew transfer the gear for you and you take only the fins and mask with you. Of course, you can kit-up on the main boat if you prefer that - I always did that on night dives because I did not like kitting-up on a dark boat. Once on the panga, the procedure is the same - backflip entry and kit-off before exit just like the dinghies.
There may be some differences like above, but I have been on several liveaboards in the Indo-Pacific region and they are all well geared-up for the job. If any guest requires special assistance, they will provide it.