I'm sorry, going to be a bit harsh here and say that an NHL team in Louisville simply isn't going to happen. NHL has the first then last say on all relocation and expansion and putting a team in Louisville is on page 64 of the NHL's "Book of Concerns" behind "are NHL players eating too much garlic collectively" AHL is extremely unlikely, and in that case it wouldn't be affiliated with Nashville since they've been with Milwaukee since their inception and have openly said a million times they will never change it under any circumstance (Brewers owner owns the Admirals and the Brewers have an affiliation with Nashville's AAA baseball team). St. Louis is a still-not-so-likely maybe and the only reason getting an AHL team isn't impossible and that's because they're the only NHL team in your area who's had untenable an AHL location and ownership.
I've been fortunate enough to talk to some professional hockey people (AHL HQ is in the city I live in) and from what I've gathered, Lousville isn't on the list of cities that's getting an NHL or AHL team. Main reasons are, while you claim there is potential in the market and I can't disagree with you because I don't know, they still have never held any hockey game in the arena. Every serious potential NHL or AHL market has held pre-season games or something in the arena, case in point Kansas City when they tried to grab the Penguins, Quebec holds Canadiens preseason games each year and has a major junior team as their tenant, Vegas held games, Houston houses their AHL team, Seattle is home to two major junior teams, etc. If Louisville was holding 2 Preds preseason game and sold them both out, then it's a different story. But, it hasn't so since. For the AHL, buying a relocating a team isn't going to be possible because policy since 2015 mandates that teams, if bought and relocated (can't buy an AHL expansion franchise since there's 31 and the 32nd is being saved for Seattle and will be put in the Pacific Northwest probably Portland), they must be put in a geographically advantageous position, with most NHL teams owning their AHL team (just take a look at the AHL Pacific Division, CO Eagles, and the rest if you don't believe). No owner is going to buy a team and move it to a market where there is no proven interest and isn't near any NHL market, besides St. Louis, that doesn't have a long, illustrious, and untenable AHL affiliation. Just how it is.
ECHL, SPHL, and USHL are all much more likely. But, if those two leagues really thought they could put a team there they would have done it already but, once again, there hasn't been any games held in the KFC Yum! Center and that's a HUGE determining factor you just can't ignore.
If you really want to start determining if there's hockey interest in Louisville, it starts with UofL's club hockey. Start playing out of KFC Yum! Center. Demand things that a pro team would demand. 3/4 practices per week, game times at prime times (Wednesday, Friday, Saturday, Sunday nights are when a lot pro hockey games are). See if the arena is willing and able to do things they would have to do with a pro hockey team like switching from basketball to hockey almost daily like they do at TD Garden. See if it's possible to split time facility sharing with Louisville basketball, just like a pro team would. Market the team and if the support is what you say it is, play University of Kentucky or Cincinnati a few times and try to get a few thousand people on a Saturday night against your biggest rivals. Do that, and it's going to do a whole lot more than all of this speculating potential hockey interest in the city.