generally when it comes to anything with motorcycles it is a small community, try and get people to spread the word, example stuff for free? make videos? Market it i suppose, what would make someone go to your store instead of the one next door or why not go online...
Legal and insurance
I assume you are licensed to ride ?
Yes, the 2007 is one of the lowest ever and can be lowered. Best of all is the pre 2013 Street Triples. Then you have all the Bonnevilles, Tiger low, Indian Scout and many cruisers, all just right for smaller people. I've not tried anything else so can't say what else there is.
Just remembered, the Diavel is a lot of fun to ride and the early ones have a very low seat height. Not sure about the later ones as I haven't tried one.