you can use …/osprey/libraries/FID-A/inputOutput/io_writelcmBASIS.m or …/osprey/libraries/FID-A/inputOutput/io_writeTarquinBASIS.m to generate a .basis file.
You might have to do the resampling first by running the fit in Osprey and exporting the resampled basis set from MRSCont.fit.resBasisSet.metab . You can also call LCModel from within Osprey for conventional MRS if you have a fully complied version of LCModel on the same machine.