If you're really consistent and make every rep a max effort, yeah you can probably make pretty serious strength gains on not much volume.
Something like 5-10 singles of deadlift once per week and then pick a pet lift for upper body like headstand pushups or military press would cover most of your bases.
You can do Doug Hepburn's singles routine and see where that gets you. The gains will probably be somewhat slow but it might be what you're looking for.
I do recommend more volume for upper body though. You could just smash pushups and hspu on the regular and that would be good enough if you're looking to cut down on overall gym time (i.e; do nothing but lower body on gym days).
Something like 5-10 singles of deadlift once per week and then pick a pet lift for upper body like headstand pushups or military press would cover most of your bases.
You can do Doug Hepburn's singles routine and see where that gets you. The gains will probably be somewhat slow but it might be what you're looking for.
I do recommend more volume for upper body though. You could just smash pushups and hspu on the regular and that would be good enough if you're looking to cut down on overall gym time (i.e; do nothing but lower body on gym days).