A very nice trip is ”Indre Troms”, not as high mountains but much less people, and very nice huts (remember key). Bus to the northern end of the trail in Kilisjärvi, train to southern end in Björkliden.
Another nice area is west of the border from Abisko-Nikkaluokta, also key needed for the huts. In this area you can go back and forth between Norway and Sweden. You can start in Katerat ( only train) and end in many places…
You can find info about both areas at ut.no, and remember to check which lakes are unsafe since they are regulated.