I know how easy it is to damage the silicone seal Keith that gives the spoked wheel tubeless tyre properties. Suffice to say don't be tempted to adjust spokes however slightly - you will damage seal, although I managed local repairs on mine as below..
The key points are to lever the tyre off carefully from the rear to avoid damaging the silicone seal. Have them replace the schroeder valve on the metal valve bodies otherwise you end up with rubber valves.
I always provide a guide on jacking points & the tyre pressures as otherwise some fitters go for 38 psig. .
I have been driving at least one of my Plus 8s, at any one time, with wire wheels (30 years).
My wife loves them. 
1. I have a bespoke 3 eared spinner for the Canadian Morgans and had a bar length made that when used as far as I can manage, results in the correct torque.
2. I use Enzio's (Ferrari) recommendation for wire wheel torque rather than the MWS. I have never had a problem with the splines (they wear when loose) on my MMC hubs, my MWS adapters or the hubs on my wife's etype.
3. I have found that all my wire wheels, of any type or source, need re-tuning every 20-25k miles. I have the tools and do it myself without any prejudice to the silicone air seal. (10 wheels over 30 years)
I guess I am lucky, seriously. I have a wirewheel tuning fork and adjustment tool. I would never attmpt to adjust wires form the inside!!!!!
The key is that adjusting the wires is absolutely necessary when needed. On the one hand, most wire wheels are not strong enough to avoid anomalies over time, on the other hand, the tuning the wires correct that. One
sign of wonky wire wheels is when your tyre guy tells you that he is putting more and more balancing weights on your rims. I have my wheels balanced once a year. IMHO, if one does not want to tune one's wire wheels, buy
new ones regularly or switch to alloys. Morgan alloys are quite attractive. If you want others to do the wire tuning for you, motorcycle shops are great. Beware, a good driver's driving imperceptibly adjusts to defects. You don't
that to happen.
4. Normally, owners and the people they give to take care of their tyres put far too much air pressure in their Morgan tyres.
It is one of the things all our trad Handbooks always get right! (or the best approximation to
start with.) To be more precise, I warm my tyres up with a short run, then do a patch test using damp tyres and newspapers.
Morgans are some of the lightest road cars in the world. Tyres are their most important component as they dictate comfort and comportment. Logic means their extremely low weight dictates extremely low tyre pressures. Their
all-important tyre "patch" on the road is a function of the car's weight and the tyre pressure. (duh!) Too much air and the car runs on in the middle of the tread, too little and it runs on the tread sides. Both are sad for the
driver/passengers. I have a special MMC lightened Plus 8 and run at 20psi normally. My other two Plus 8s ran at 22 psi.
This can be increased to 25psi if one wants to save on petrol on long motorway (aka Interstate, Autoroute)
driving. I don't bother anymore. We are so rrarely on such non-fun byways.
Here is a fine article by David Poole.
https://www.gomog.com/allmorgan/wirewheelbalancing1.html Yes, wire wheels are a proper pain. But they are gorgeous.
gmg
