Why not fit them yourself!
Use a suitable sized truck tyre as a workbench, don stout boots and walk the tyre on. A plentiful supply of tyre soap or talcum powder and it's not as hard as you'd think. If you do have to use a lever, just make sure you don't pinch the tube.
I don't know if I'd get away with it at high speeds, but I have no balance weights on the Avons on my car. Feels good to at least 65, car's not been faster.
In the UK, any tyre place will give you a used truck tyre as that way they don't have to pay for disposal.
Over my many years of motorcycle tire changing, starting back in '66, I learned early on that once I had the tire, sorry tyre, half on I added the new tube. Once the tube is in and I have the stem partially through the rim I put the nut on just a nut's worth of threads. THEN I partially inflate the tube, just a little. This keeps the tube from being pinched while working the rest of the tyre onto the rim. Once I started to put a little air in the tubes, by pinching days were long gone.
As far as Dynabeads go, they work great. Lots of guys on the CVO Harley forum run them and love them. But they can be a bit messy when changing out tubeless tyres. Now with the tubes being used to contain the beads, I believe you would have an advantage over the tubeless application. I'd go for it and let the forum know how they worked out for you.
