Battery configuration, will this work?

Current configuration: one motor with 38 amp alternator output, one starting battery, one deep cycle marine battery, a/b switch to switch. Two trolling motor batteries (24v) stand alone with onboard AC charger.

Option A proposed configuration: one motor (new to the configuration) with 7 amp alternator connected to starting battery, one motor with 38 amp alternator output connected to the same starting battery. remove the A/B switch. Install a Minn Kota 3 bank DC charger connected to the starting battery with the iginition circut connected to the larger motor/alternator. The the three deep cell batteries would be connected to the output side the the MK DC charger.

Option B proposed configuration: one motor (new to the configuration) with 7 amp alternator connected to starting battery, one motor with 38 amp alternator output connected to the same starting battery. Leave the A/B swith. Install a DC to AC inverter and connect the onboard AC charger. Manually control the charging of the accessory deep cell with the A/B switch and have a diconnect/connect for the AC inverter.

Will either of these options work or what needs to be tweeked?

Can I have two motors connected to one starting battery and possible at times have both motors running?

The goal is to be able to use the big motor to charge the trolling motor batteries. The boat is moving to a dock with no AC power available so really I am using the big motor as a generator when needed.

Thanks in advance for your thoughts, this community is the best when it comes to seeking honest, helpful opinions :-)

Tracy