I too am personally no fan of turbo powered sailing boats. However there are some cases where it might be the only solution.
The engine room compartment is to small to fit in a non-turbo of desired HP range.
Weight might be an issue fitting a bigger non-turbo (going from 4 to 6 cyl).
However the turbo does not get glowing red in the dark, the exhaust turbine housing is water cooled! The heat emission to air does not get significant higher from same engine type with turbo, but the air consumption encrease which might call for modified ventilation . If properly arranged ventilation, the running temp in the compartment might be reduced due to encreased consumption of the air and quicker circulation. The main 'problem' might be the turbo itself, but most likely only after 1000hrs+ of running time depending of use.
The specific consumption of the turbo engine is lower than the normal aspirated one, but only in the turbo rpm range: above about 2500rpm.
However do You need more HP ore do You need more prop-shaft torque?
Have a talk with Your prop supplier and check. Perhaps a different gear ratio and new prop will give You what You want.
Unless You have a dream of sailing with a decal at the transom saying 'Turbo Powered', I would have tried something else.