To make this change work you have to replace Ankin’s saber with Luke’s throughout TFA and TLJ.
No you don’t. Why would you?
If the whole idea is that Luke’s legend as a Jedi grew in the years after ROTJ, most people would be familiar with his green lightsaber anyway (he’s had that for 3 decades compared to a couple years with the blue one), so it makes more sense (to me) for his projection to use his green one rather than Anakin’s blue one.