You could try something like this
1) Squat - work up to one or two heavy singles (~95%). Going 3@70%, 3@75%, 2@80%, 2@85%, 1@90%, 1@95% or 3@70%, 2@80%, 1@90%, 3@75%, 2@85%, 1@95% and increasing 5-10 lbs every fortnight has worked for me in the past
2) Deadlift variation that targets a weak point (off the floor, lockout, etc) - 5x2-3 @ 80ish%
3) Other stuff, could be more leg work but I'd recommend something broader like loaded carries or conditioning and maybe something for shoulder health (band pull aparts, face pulls, etc because squatting DOES affect your shoulders and elbows)
1) Deadlift - work up to one or two heavy singles like for squats on day 1 OR ramp up to 5 to 10 heavy singles, depending which you prefer (the latter is more for pure strength and can be pretty taxing once you get stronger)
2) Squat variation targeting a weak point - 5x2-3 @80ish%. Front squats are great here IMO
3) Other stuff, again something like loaded carries or conditioning
Day 3 - I'd recommend only doing this every second week because there's a fair chance days one and 2 will be pretty taxing
1) Box squat variation - 5x3 @85% or so
2) Good morning variation - 5x8-10
3) Other stuff. This is the one day where I think leg isolation/machine work could be good (hack squats, lunges, split squats, etc)
Also, in terms of upper body avoidance bear in mind that squats and deadlifts do involve the whole back very, VERY significantly. You would probably be well advised to do something that keep your middle and upper back nice and strong or you will very possibly find it hard to progress your squat and DL. Not meaning to pry, but it'd be useful to know if you're on any hormone replacement therapy (not sure if that's the right term), as I'm sure that may have an effect on how you'd respond to upper body training. You could also train your upper body in the 1-3 rep range just to keep it strong and healthy and that should minimise the chance of getting any bigger in that area while still getting the benefits of being stronger overall.
EDIT: that is useless as #$%@ without a progression model. Apologies. I've found 5-10 lbs per fortnight works well for the 1) and 2) exercises. Other stuff can be a little more fluid based on how you feel. You can get away with doing 1) and 2) back to back one week, if the next week you do them at either end of the week with 3) in the middle. I've run the 1) and 2) days for 12 weeks like that. I added the third day because you could do that, I didn't because I needed to focus on other stuff (upper body mostly).