Just don't descend the Col Du Glandon and expect your wheels to be the same shape at the bottom, rims totally deformed, only way to keep tyres on the rims was to reduce the tyre pressure to virtually flat Ruined my Marmotte ride
Who told you have shin splints? If it was someone who just said it sounds like shin splints, ignore it until you have a proper diagnosis, until then chill as you still have 3 months. Carry on with what you can do, swimming, aqua jogging, core work etc.
My pain was in the front shin muscles, it was manageable if I walked slowly but if I tried to up the pace let alone try a run I'd be in agony, it got so bad I couldn't walk a 100 metres. This pain would subside after a couple of minutes rest. After the Op my calf's both complained due to the increase in flexibility but that's quietened down to a point that I'm jogging on a trampet and looking forward to starting light jogging soon.
I had to go private using the Spire Hospital Cardiff, I had both the shins done back in November, I was back on the bike in a couple of weeks (lightly) skiing in January and I'm walking pain free again