Suntour indexed shifters do not play well with Shimano cassettes and freewheels because of different cog spacing... in friction mode they are universally compatible and on a touring bike indexed shifting is not as essential as it is on a road bike or mtb as you can usually see the hill coming from a long ways off.

Shimano 7 speed bar ends are indexed with a selectable friction mode and my shifters are the 8 speed version... since I tale my bike off road and like to ride some challenging and rapidly changing terrain the indexed shifters work well.

Suntour friction bar cons are half ratchet and shift very smoothly and once you get used to them the shifting is as good as indexed... I use these on two of my touring bikes.

Your derailleurs are only indexed in that their design allows for indexed shifters to be used... most pre indexed derailleurs had different geometries that do not allow for good indexing although there are some exceptions that just seem to work.