Yes, the popular new gear used has an 11 tooth top gear, which are difficult to find on a freewheel unit, so there are few choices available.
https://www.amazon.com/DNP-Epoch-Fr...id=1489543616&sr=1-1&keywords=11+28+freewheel
I've read a couple of negative reviews regarding this unit, but there are MANY more very positive reviews, which would be in line with my experience using it. I love it. I can now keep up with the pedals to speeds a little over 20mph. Not that I go that fast frequently - but the option is there if I want it. I'm no longer limited to 15mph or so because I can't pedal any faster.
If you are going to have a tech make this mod for you, have him go through that second link I posted as there are a couple of options mentioned regarding the special wrench required towards the end. One is a socket looking affair, which will need to be modded. The other has a handle built on to it with a much larger center opening. This tool is the plan!
Regarding the display and controller, unfortunately, no. There is no plug and play solution - yet. There is a fellow on Youtube that's made one available for the Sonders bikes, and it seems like I heard him say he's working on one for the Rad bikes. IF he comes through on that, the mod is not that expensive, and worth every penny to those that would like additional control over what's going on with their bikes. What would make his kit unique would be it would be supplied with connectors matching the ones currently used on the bike - making an entire re-wire unnecessary.
I installed a full hub kit to allow the install of the LCD3 dislay and KT series controller on my bike, which replaced ALL of the bikes electronics, including the motor. The only thing I used over again was the battery. I figured if I'm going to get my hands dirty I'm going all out, so part of my conversion included a new 1500 watt motor. This conversion, including a new rear rim w/hub motor, was less than 300, and even after adding that price to the purchase price of the bike, that left it pretty affordable as compared to most any other similar bike on the market. This was my 3rd conversion, and I had it done in a day at an old man's puttering in the garage pace. Techs do them routinely in about 4 hours..... -Al