leg extension and curls

I do not have a leg curl and leg extension machine at home. I do have a pulley pull down machine with a low row also.

should I do leg curls and leg extension with the pulley machine, or is it not effective?

what exercises do you recommend to replace leg curls and leg extension with for isolated work for ham strings and quads, on the bodybuilding I routine it says for isolation quads we could do goblet squat, or isolation hamstrings we could do single leg Romanian dead lift or stiff legged deadlift with DB or BB, would these be as effective at isolating the hamstrings and quads as the leg curl and extension?

For abs, is unweighted work better than weighted work? for example, doing hanging knee raise it is every easy for me to get 20 reps for 4 sets, so should I add weight? I don’t want my mid section to look bulky, but do want aesthetic abs. same for the crunch.

If we want to do deadlift, is the trap bar deadlift as effective at hypertrophy than barbell conventional deadlift (the trap bar feels better on my lower back). Also, it seems the conventional deadlift is a glute/leg exercise per the bodybuilding routine done on leg day rather than back day which seems to make sense.

AC,

I think you can do both leg extensions and leg curls with a low pulley. Provided you can set this up with the equipment you have, I think it could be effective.

The templates you have offer alternative selections for the isolation work. I think all of the options are about the same.

Regarding the ab question, I do not think unweighted is universally better than weighted, no. Some exercises lend themselves to external resistance and others less so. Main thing is to get somewhere near failure within the prescribed rep scheme. In this case, I’d go to straight leg raises vs adding weight. Training with weight for trunk exercises does not increase bulk of the midsection more than bodyweight only.

The trap bar is fine for a hinge variation.