definitely not ideal, as your lo will associate feeding with going to sleep if that is what happens everytime he goes to sleep & it does encourage short naps & lots of night waking, as when he goes through a light sleep phase he will need the same conditions to go back off to sleep.
if you really think your lo needs the extra feeds, then it would be better to try EAEAS, but ideally you want to feed every 3-4 hours & not less often to avoid problems. Also if your lo is always falling asleep feeding, then you will have a snacker on your hands as if you are only gettting short naps, then the awake time is also short, so I assume he is feeding every 2 or so hours.
What does your day routine look like, how many naps etc? what do you do to wind down?
Also PU/PD may be too stimulating & if you do it then revert back to feeding, then your lo knows just to keep crying & you will eventually go back to what he trusts
PS occasional nursing to sleep is ok in a baby who can fall asleep with out nursing most of the time... I nurse my 3mo off about 2x week on days when his naps get messed up by activities for my toddler, but as he goes off on his own most other times it isn't a problem