Woodys Wheels is the go to place in the USA as far as I know. People are always recommending them on others sites for this sort of conversion.
I contacted Woody's and indeed they offer this service using the Outex kit. I had inquired about having them relace the wheels using my OEM hubs with a 2.5" wide front and 4.25" wide rear rims using SS spokes, then taping them for tubeless. I was quoted ~$700/wheel to do the job.
In searching around I found Dubya Wheels in SoCal and they quoted me about $750 or so for BOTH wheels to do the relacing to Excel rims with SS spokes but no taping mostly due to liability issues. They gave me some hints on doing it myself etc. So...... for about 1/2 the price, minus the shipping charges from CO to CA, I'm looking at doing it myself, even though I'd prefer to pay a shop to do it if they've done a lot of them.
I was told that Excel rims has purchased the BART Tubeless company and "might" offer that service here in the States. But..... when that will become a reality is unknown for sure. I don't think shipping my wheels to Italy and back will make sense.
For reference, the Outex kit runs about $100/wheel, not cheap compared to the 3M tape around $15/wheel or so. The primary difference appears to be the Outex kit includes some "things" to place over the spoke nipples while the 3M tape is just the tape itself. It was suggested to me to use RTV over the spoke nipples (letting it setup up hard) prior to applying the tape. So you'd need to factor in the difference of the cost of large tube of RTV plus application time vs what's provided in the Outex kit.
I would still prefer to have my wheels laced to proper tubeless rims like the Alpina or similar. After some investigation I have mixed feelings on the Kineo wheels. They are kinda heavy, expensive, and supposedly not that strong. My preference would be for the wheels like the Super Tenere uses but they appear to be proprietary after asking around.
In searching around I found OEM replacement Super Tenere bare rims but .... they are $298 ea, OUCH.