Hello
Since underfloor heating warms up a larger area than a radiator, it should, in my opinion, be sufficient. Then if the radiator can remain, keep it?
I did a kitchen renovation last year and installed underfloor heating, and it is enough for us to keep our kitchen and dining room warm without help from the 2 radiators that are also in the same area.
The underfloor heating loop I installed was approximately 50 m long.