Same here. Can be done in about 15 mins.
Regarding resale-limited, exclusive group. I think maybe you were misinformed. The BH77 is used across many models (large B-50 series thru small L-01 series, including LX models). The only difference would be the subframe itself which was typically under 1K. So, potentially there would be a larger market.
You didn't read all of what I wrote. I know the BH77 is used on a lot of platforms, including more of the L series than you noted, and that it also has a few variants that aren't denoted by the model number. I have the instructions/marketing materials for it, and I did actually read all of it and look at the purty pictures. I was tempted to get out my crayons, but the missus has me on a low-paraffin diet at the moment.
A BH77 for an LX2610SU (swivel seat) will not work on a CAB tractor (no second seat or platform for it). The glass gets in the way just a little bit if you don't have the second seat. A swivel seat in a CAB tractor is almost as useful as a screen door on a submarine. A backhoe on a CAB tractor sort of defeats the entire purpose of the cab altogether unless you are NOT using the backhoe. Either the dealer told me that the subframe for the SU wouldn't fit the CAB or ROPS model LX's with mid-PTO, or maybe I read it in the propaganda. That narrows the market considerably to LX-2610-SU owners. The SU model wasn't designed for cheapskates and tough guy wannabes. It was designed for the utility tractor market leaving some of the cost of the tractor available to offset the cost of utility type equipment. It was never intended to be a golf-green mower. It was designed for people that are OK with sitting outside to operate a backhoe, because that's where you're going to be sitting if you're operating a backhoe.
I also said exactly what you did about the subframe (other than the price). That is the part that will have a very exclusive market as it ONLY fits the SU tractors, particularly the LX2610SU. There is no SU version of the LX-3310, that I know about. Yet. By the time I'm done with with the BH77, LX2610SU subframes will be more common, and I'll just have a very large chunk of steel hanging under my tractor or occupying space somewhere if I sell the BH77 without it. The subframe is currently the hard part to get because it's completely different from any other model, and designed for a new model. The LX line was ready before the rest of Kubota was. Since the BH77 fits so many different models, the dealer had 4 of them 'on the shelf'. Since he had no subframe and couldn't transfer complete ownership to me without it, he couldn't take the sale.
Ergo, if I ever own one and decide to sell it, I'd prefer to sell both pieces together as a complete package. Don't really care whether or not the buyer can actually use it, but I don't want to separate it and devalue either piece. The last thing I want is have someone trying to low-ball me because it's an incomplete package or doesn't fit their tractor. That isn't my problem at all. Suitability for use is completely up to them and their responsibility, and not something I should have to consider when selling. If I sell, I'd be doing so to get rid of the machine completely, not just part of it. A subframe without a backhoe is pretty useless, as is a backhoe without a subframe. This is the very reason I don't already own a BH77. Kubota isn't being very responsive at the moment (as if anyone else is, either). I ordered parts the first week of December for another piece of equipment. I got them day before yesterday. I prefer to keep my money in my pocket until I can actually touch the product I'm about to purchase, new or used. I'm very old school that way.