[CA] [CA11] E120 Seatalk1 to NMEA 2000 conversion requirements

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Question about network re-configuration associated with software upgrade

I have an E120 chartplotter and a Seatalk1 nework wih the following devices attached:
1) ST60+ Speed
2)ST60 Wind Analog head
3) ST 40 Depth
4) RS125 GPS
5) Unknown device ID = 208D v2.04 (I suspect it is the GPS antenna)
Serial port with AIS tranceiver attached capable of delivering both AIS and GPS NMEA 0183 sentences
Current software version is 5.52
I want to upgrade to the latest software vor the E120 (V 5.69 as far as I know)
It is my understanding that the RS125 will not function under V5.69.
I have the following questions:
1) Could I simply remove the RS125 and use serial GPS data for location (V5.69 software)?
2) Or must I convert the existing Seatlak1 network to Seatalking network using E22158 SeaTalkng Converter Kit ?
3) If I need to use E22158 SeaTalkng Converter Kit, can I use GPS data from the AIS tranceiver over its NMEA 2000 interface?
4) If I want to connect other NMEA 2000 devices can I attach the E22158 SeaTalkng Converter directly to a NMEA 2000 backbone? If so, what cable is neded?
5) When using the E22158 SeaTalkng Converter connected to a NMEA 2000 backbone, how is the Seatalking backbone powered and how is the NMEA 2000 backbone powered?