I believe it likely that the more outrageous your demands, the more excited you both will be. Just remember that if you break your toys, they're no longer fun to play with.
I also believe that even if he later decides he doesn't like the look, feel, or maintenance of a PA, he'll be turned on even more by the fact that it is there solely for your amusement.
How much is too much? Well. Did you two have a nice long chat about boundaries and expectations at the start of your relationship? Stay within the boundaries, and periodically reassess them together.
As someone who is submissive and was married to a Dom for six years before he was killed, who has been involved in the BDSM and D/s lifestyle since I was 23, and who has been to workshops, meetings and munches, I have developed some very close friendships and relationships with Masters/Doms/Tops, slaves/submissives/bottoms, and Dungeon Masters/Monitors, both male and female in each category.
As a submissive, I understand how easily emotions and the desire to please can push us past boundaries in a way that is unhealthy for us. The advice to stay within the boundaries and periodically reassess them is right on. There should always be "down" times of equal footing where issues are discussed. Most couples go thru a very detailed checklist of activities when going into the relationship, and will have or form soft and hard limits that may often change. The assumption that a sub may later not like something but will still be turned on by it is a slippery slope. A mistake can lead to depression, anxiety, resentment, and anger.
A D/s relationship, which is basically any relationship in which there is an exchange of power, depends greatly on trust and communication and forms a bond that many vanilla people do not understand. We all have to start somewhere, and the healthiest D/s relationships and people in the lifestyle I know are consistently seeking knowledge, training, and are open to learning. To many, it's not about games and dressing up, and those who abuse their power are not tolerated. It's a belief system that has varying degrees.
There is a belief within the community that a good Dominant often starts out as a submissive. Unfortunately, the lifestyle attracts many wounded and many abusers. There is no such thing as being "too" careful.