Hi,
I don't think that there is a way, but being lucky.
You could bend the tree or put a brick under the pot for the trunk not to be up straight. This should trigger the upside buds.
You could then move the brick to trigger the buds on the other side.
Trimming the faster stems after 3 or 5 leaves is nevertheless needed to get a well balanced tree.
I had trees getting to a better shape after 3 years. Every year one or two new buds would start from the trunk ...
Good luck !
PS: why are you trimming those trees now ? Wouldn't it be wiser to wait till the beginning of March ? I'll be doing mine just after the 1st of March ...