Flying from Wick to Iceland via RATSU ING or similar at any reasonable unpressurised IFR level presents no problem for VHF only.
The leg from BIRK to Narsarsuaq will take you out of VHF coverage at unpressurised levels, but seems to be largely un-policed and it is relatively easy to relay Ops Normal and Position reports via 123.45
You will similarly lose VHF coverage on a Narsarsuaq Goose leg, and the Canadians are getting much more stroppy about non-HF equipped aircraft flying the route. Practically, this is more of an issue coming Eastbound, where you may be denied startup clearance if you don't claim to have HF on board. Satellite is not accepted as an alternative. This never seemed to be an issue until a few years ago, but rumours of fines abound in more recent times.