My father has Parkinsons with dementia. He has been in and out of the hospital and rehab facilities, but due to his delusions and confusion, his agitation becomes an issue. He is unable to walk on his own and is a high fall risk. What kinds of facilities would be able to handle his agitation and combativeness, without drugging him, which has been the norm in rehab?
If your father is on the "right" medication(s) it should help with his delusions and agitation, and make him much easier to place in any memory care facility.
Please come to terms with the fact that dementia robs people of the ability to regulate their emotions and reactions, and they become increasingly negative, fearful, angry, less able to express themselves, etc. Giving them medication to alleviate this constantly distressing state of mind is merciful. The goal is quality of life, and if that includes medication to give them a more peaceful daily life, then it should be considered as a solution.
Just like you wouldn't withhold pain meds from him if he had cancer, neither should you withhold pain meds for his mood and mind.