[CA] Replacing Pathfinder Radar and Displays

My 49’ live aboard trawler has a navigation system consisting of the following Raymarine Equipment
Raymarine 400G Course Computer
L760+ (lower helm)
B744V Through Hull Transducer
RL80C+ (upper helm)
ST6002 x 2
SeatalkNG to Seatalk II Converter
RS130 GPS
24” Radome 48 mile Analog Radar

My radar is failing and I am looking to replace the radar and two multifunction displays. I would like to replace the MFDs with one that has the ability to use a chart that is based on the Explorer Charts. Another priority is a depth sounder that will track the bottom in shallow water and in turbulence. I would rather not replace the one year old B744V transducer unless replacing it improves the depth sounder shallow water performance.

Will you make recommendations for 2 MFD replacements (one for the fly bridge and one for lower helm) and a new wired Radar scanner? I’m not a big fan of touch screens but it looks like that is the way the technology is going.

Do both need charts?

Will my B744V fit without changing the connector? Is a connector available?

Thank you for your help
Shay