Dvito,
I think getting people to lift 2x/wk is adequate for many with respect to health promotion. 1x/wk is probably better than nothing as well. Neither are sufficient for weekly exercise activity, as additional conditioning work is needed.
In general, I’d pick 3 compound exercises per 60-minute session, likely a squat, hinge, and push or pull pattern. I do not suspect their will be time for much else in the session, though some targeted isolation arm, upper back, posterior chain, or trunk work could be included. I would not spend their time doing conditioning during their time with you, but rather find solutions for them to do this on their own.
I would cycle through something like the following for 1x/wk sessions:
Week 1: squat, press, RDL + lat pull down
Week 2: DL, bench, row + hamstring curls
For 2x/wk, it’d look something like:
Day 1: squat pattern, press pattern, hinge pattern + acc
Day 2: Press pattern, squat pattern, row pattern + acc
I think that regardless of frequency, training intensity should be pretty similar, e.g. use a variety of rep ranges for each pattern to build a big base of physical development. Each of these should be done to ~ 4-5 RIR or less. Volume should be tailored to the individual based on their needs, likely somewhere ~ 5 to 8 sets/wk for each movement pattern to start and building up from there. I would not rest less than 2-3 minutes between work sets. I talk about why extensively in the rest periods podcast here.
All in all, these restrictions don’t really change how you program. Our current programming resources include about a half dozen no cost podcasts on the topic, a similar amount of articles, plus the texts accompanying our most recent templates, e.g. Bodybuilding II, General S/C II, and the Low Fatigue Templates.
Cheers!