It’s not over until the fat lady sings, as they say. But, for one club’s hopes of signing the £3 million Rangers man this summer, she is giving the lyrics one last read through while preparing her scales. Over the last few weeks, the sheer finances required to take Sam Lammers away from Ibrox – on a permanent basis this time – have had even some of the more well-heeled Eredivisie clubs scrambling around for cash. Lammers allegedly earns £20,000-a-week at Rangers. And while the Glasgow giants may be willing to sell the former Atalanta, PSV Eindhoven and Eintracht Frankfurt forward at a loss, FC…