We had Kato Marine davits on our IP27-#058 for many years. We also had a 10' dinghy hanging on it. Yes that was a bit large, but it worked. Then we took then with us to our next IP now a 35.
Did you see these for sail in our ADs link?
ipyoa.com/ads/1-gear-for-sale/215-atkins-hoyle-davits
They could work.
If not, look at
KatoMarine.com
Hayden