There is no real need to use a Hawaii based legal firm to convey a real estate interest to a trust.
There is a strong suggestion that you use a title company that is familiar with Hawaiian title transfers (there are many) to re-deed the property to the trust.
Placing a real estate (timeshare) ownership in a trust protects the value and ownership of the asset from probate and greedy heirs/debtors.
No, the HOA/corporation can not simply 'eat' your estate because you're dead and the trust owns the timeshare.
Yes, the trustee/executor will have a responsibility to manage the trust/estate once you're gone; this includes assets and liabilities.
So, my advice (my ownerships are in trust) is to place 'assets' with some value in the trust.
I would not place timeshare interests that are pure liabilities or unwanted in the foreseeable future in the trust.
I do not view all timeshares as liabilities as some do.....certainly there is great benefit in some developer-only rights that can be preserved via trust.