++++++++++++++++++++My first option is open then to travel south, Coorg, Ooty, Allepy, Mysore and return then ...
Let’s see what updates u get for roads/highways etc.
My concerns are roads after Mangalore or Coorg and in/around Ooty.
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My suggestion to you is to drop Alleppey by driving down. You can do this trip from Goa separately by Train. Lot of train options are available.
You can combine Coorg - Mysore and then go to Ooty. So route from Goa - Karwar - Kumta - Mangalore - Puttur - Sulliya - Madikeri - Hunsur - Mysore - Ooty.
In return you can chose to come via Salem - Bangalore - Hiriyur - Hosadurga - Ajjampura - Tarikere - Shimoga - Sagar - Honnavara - Kumta - Karwar - Goa.