@Ricardo T we did Norway in summer ‘22 for 5 weeks. Tunnel etc same as you plan.
We did the ferry from Puttgarden to Rodby then straight up and Helsingor to Helsingborg.
You can book it as a combined ticket for about €90. It’s really easy and saves time and fuel.
Helsingborg is lovely and we spent a day there on the return journey staying at the motorhome sire which is on the harbour.
As you’ve got your toll tag and ferry sorted, have you linked the two together? And have you prepaid your ferry account? If you prepay then you save 50% on all ferries. However, it’s not as amazing as it seems as some of the west coast ferries are free and the others are heavily subsidised. Many are just a few quid.
However, if you plan on doing the Bodo to Moskenes route to Lofoten then it saves you about £45 each way.
We did the ferry Bognes to Lodingen to get to Lofoten. It’s quick and easy and drops you into Lofoten high enough up so you can then drive down southwards and not miss anything.
Don’t allocate much time to staying in Bodo. Apart from loads of white tailed eagles it’s a whole load of not much.
If you can get to Tromso then do so. We stayed two nights and loved the place.