You’ll make life much easier in future if you put a chamber there, from the perspective of pulling in new services.

Also run in two lengths of 10mm blue rope into the 54mm duct. Try to avoid knots. Just buy a full reel, its cheap as chips. You’ll then have a spare draw handy once the initial service is pulled through.

If this was in town with the possibility of other providers rolling out their gear, then I’d recommend running in a second spare duct whilst you go to the bother of trenching and putting in chambers. But as you’re in the sticks, the likelyhood is slim unless you know that another provider (for example like a Gigaclear) is coming then I wouldn’t bother.

With the state of tech these days you never know when you may want another cable path from premises to boundary - even for your own gear, access control, cameras etc etc…