After a whole day i'm able to run stunnel with openvpn. From a fesh install of Pf. Vpn, nat,rule give the vpn working fine. i don't set any dns. Dns leak , as it seem not possible to set DOH or dot in pfsense with just : providerdns.com/dns-query.
the how: make sure Vpn is set to tcp 1194 and work fine before.
So install stunnel package / then put:
client mode check / listen ip : 127.0.0.1 /listen port: 1194
redirect to ip : vpnprovider.com / redirect to port: 443
log: notice / timeout : 0 / custom option: it,s exactly as your provider conf file. if they write option = noSslv2 , you put it all. If not it will just not work. The box custom option could be rename to : extra setting to be more clear. This is the first guide on internet.
Also, passing from a first ovpn inudp1194 do work fine, no forward port or anything else. A bit slow to get the page load directly, but all fine, dual vpn back to back.