In some samplers of others DAWs (or 3rd party samplers) you can put the Start of a sample AFTER the start of the Loop mark, but in the Sampler of Cubase doesn’t allow you to move the Start slider after the Loop point if you have it activated.
However, there is a bug where, if you select “No Loop”, you can put the Start point after the previous Loop point, then you activate the Loop mode, and finally the Sampler can play the loop before the Start of the Sample.
But yeah, this shouldn’t be a workaround, but rather a feature that many samplers already have. 