Ok.
please do not get angry.
In April, the road condition can be very nice and dry, or hellish, slippery from snow and ice. In worst case we have rain in the evening and plus degrees, then it gets freezing during night and the road is slippery like an ice hockey rink.
Dry tarmac now, a huge melting ice patch just around the bend.
As Norway is a long country, you will get a huge difference in climate from the south to north, from low lying areas to the mountains.
Spring in the south, snow blizzards in the north. Zero visibility. Normal.
March/April are the trickiest months for the weather in northern Norway.
Trust me, I live there part of the year. Both in March/April, and in summer..
For a safe drive, you should do what everybody does in Scandinavia, specially the north : get studded tyres.
But remember, they became illegal after May 1st.
Driving basically non stop, just changing drivers and resting when the other person is driving?
Is it really a good idea to drive tired under treacherous conditions, in a country you do not know, on roads that are winding, sometimes with a cliff on one side and a drop on the other, on the (for you) wrong side of the road?
Do you and your co driver have experience from driving on ice, snow? On summer tyres?
(I assume you will have the normal mixed use summer tyres Defender owners like ).
Have you driven that way before?
Nordkapp is a cool experience. Really cool in December, a really dry and clear day/night.
Aurora Borealis. Those clear nights are rare as hen's teeth though.
Also cool in summer, to see the sun above the horizon at mid night.
Lots of tourists go there.
Do not tell them it is not the northernmost point on mainland Europe.
It is on the promontory just to the west of Nordkapp.....
But it was easier to build the Tourist Centre on Nordkapp I guess?
Just wanting to be helpful. Be safe. No cause is worth risking your life or health for.
