What I suggest as an experiment for high frequency is, simply lift at 50% of 1 RM, 2 sets for 5 days a week.

Yes only 2 sets, which should be enough to trigger muscle protein synthesis, but not enough to hinder recovery which should take place within 24-28 hours. For deadlift I would think this could be done at 2 sets a day, 5 days a week, with weekends as the rest period. This would mean muscle protein synthesis would be triggered almost all the time, compared to if training is done only once a week or twice where muscle protein synthesis would taper off before spiking again.