Pual, 

Consider a different option- abandoning the Amel (unsupoted) system and go for you own solution using new Tech..  If it were me, I would use the space for the existing bow thruster to install a Jet type- with no external moving parts, no propellers, things to retract, gear seals, etc!  Sooo much more servicable and could use existing wirring for battery opps..   check these guys out = https://www.jetthruster.com/ .


CHris