Is it possible to pay the 5% Royalty yearly?

Actually I’m using another Game engine… it’s free… but I’m starting to hate it from the deep of my heart.
If I will start using Unreal Engine, and will set up a crowdfunding-based project, will it be possible to me to pay all the royalties in a single payment yearly, instead of doing it every 4 months? That would be great.

Under the UE4 EULA, no. Payments are due quarterly.

You can, however, request custom license terms at this link.