Any suggested alternatives to an ALIF at L5-S1?

I’m going for a second opinion in March after my neurosurgeon informed me that an ALIF is just a matter of time, and I must let him know when I’m ready.
The problem is that the nerve exiting on the left side (LHS) at S1 (L5-S1) is under compression because the disc doesn’t exist on the LHS, and is notably flattened on the RHS at the same level. This compression has been clearly pointed out on one of the MRIs I’ve had recently, which shows that LHS nerve as a flattened oval while the nerve on the RHS is circular and uncompromised.
The symptoms? Aching /pain left glute, aching / pain left calf muscle and pins-and-needles on the top of my left foot through to my toes. I can’t stand near-motionless for more than about 30 seconds and then I need to move, bend, stretch, etc. Lying flat (e.g. sleep) helps, but sitting upright exacerbates the discomfort.
I’ve had numerous theatre-visits for a nerve-sleeve root injection, epidurals, facet joint injections and, for localised pain, rhizotomies. These all provide limited relief, and only for a few weeks at a time.
Anyone here have any other ideas before I make a decision?
I want to avoid another spine surgery for as long as possible, and have even gone back to regular gym exercises for core strength improvement to help and delay the inevitable. As an added fact, my spinal issues are sports-induced.