Gab344, you can certainly do it as you will probably know Lincoln side of the Humber is fairly flat once you get past Brigg going south unless you pick up the edge of the Wolds then you’ll have some hilly bits.
Last year i set off from home (a village just north of Lincoln) and rode to Gainsborough, caught the train to York and rode home via the Humber bridge. I was on my Cotic Soul with some road tyres, it was one of the hottest weekends of the year and i had a steady headwind nearly all the way home from York 8O, after i had got across the Humber i could barely stand straight up out of the saddle i had to gently slip off the front of it whilst standing at the same time it was pretty painful on the gooch (think thats the right terminology) 😆
Anyway if you have any real issues i’m around tomorrow so pop in i live the near the Dambuster’s pub which i believe has a real ale festival on all weekend 😀