It's pretty easy to re-veg the flowering plant.
Basically, you harvest, then cut remaining plant back to a few, lower/bottom nodes and return to veg lighting. Takes a couple/few weeks to return to veg cycle.
Careful w/water until new growth flourishes. Less foliage=less need for water.
There are plenty of re-veg posts here.
I do not think there's a way to just get the buds back w/o vegging.