Very Thank you guys for the suggestions and for the alternative ways.
I know the VPN is a CPU hungry task, I’m a network administrator here in Italy (emm..sorry for the bad English

) and after 20 years spent to “fight with devices and with the users” I‘m trying to keep my house as simple as possible regarding devices, but sometimes isn’t easy to resist at temptation!
I totally agree also in a pc acting a router/firewall and the concept to upgrade only the obsolete peripherals and not the all-in-one device, but as I write before I want to keep all easy and spend less time as possible in networking at home.
Another aspect is the power consumption, actually In the EU we’re “frustrated” regarding power cost, last month I payed 0.68€/KWh vs 0.20 of the last 10 years; devices active H24 need more attention.
At the end I’ll go ahead with the AX6000, 250Mbs are enough for torrenting in my case, probably in the future with WG support will perform better.
My actual router a Fritz box 7530AX on IPSec perform 10/10Mbs and on WG 150Mbs.