A gun trust is the way to go for many reasons.
First, NFA items should be registered to the trust.
1) You bypass the fingerprint cards, CLEO signature
2) You are able to immediately have your spouse (or children, if they're over 21) take possession of your NFA items.
3) You're able to make additions, for example, adding trustees and or beneficiaries at any time.
4) You protect yourself legally by having NFA items in the trust (PM me for details)
Hawaii laws are screwy and I'm not 100% sure how "Hawaii" views firearms in a trust, upon your death, etc...
If long term is your goal, you want all your firearms in a trust. PM me if you need any specific details.