Yes, rigid body and kinematic coupling constraints are more robust alternatives (concentrated forces should work at least with rigid body reference nodes: Potential Bug Applying Radial Displacement to Rigid Surface - #4 by Matej), but they make the surface rigid. Here’s a summary of the 3 coupling types: Different coupling constraints and their limitations - Uncategorized - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).
There is *DISTRIBUTING COUPLING too - it needs rather tedious keyword edits, though and I don’t think it can work with LCS.
Of course, you could always define the force components in such a way that the resultant force acts in the desired directions.