I think you might get part of the way but may still find you get detected.
Foss DPI projects will not be able to implement the methods used by say fortinet,sonicwall, f5, juniper, Cisco, a10, and others.
This is because they all use proprietary DPI created in house.
They're not going to use Foss DPI for obvious reasons, you'll be able to create workarounds for detection and implement that in a bad payload.
During the hey day I passed hcna-rs, the first thing we were taught was to just use telnet as a means to enable shh, then log back in and disable telnet.
Moral of the story, do not under estimate a nation state's use of global tech media to effect a global drop of a product or manufacturer from the market.
So when Israel was given it's land via the Balfour treaty both sides were happy for a while. Yea some were pissed off but didn't act out.
Then when Israel got settled and comfy they decided to try to grab the rest of "their" land even though this broke the treaty.
Since then the land grab has gotten blatant and they've created their own laws to justify it, to the point that even me saying this is seen as antisemitism even though it is totally truthful.
Well done Israel, what did you think would happen.
Bitwarden+vaultwarden, harden the chosen VPS, set SSH to use keys only, then setup fail2ban for webserver and ssh
Also consider putting ffsync on it as well for extra browser benefits.
Not all domain providers will allow you to change the nameservers of a domain they sold to you as they want to sell you the rest of what you need for extra $$$
You can only have 2 name servers on a domain and it is not advisable to make them point to different DNS providers as they will both need to be authoritative and by having 2 different providers will mean you get 2 different SOA which will break fundamental DNS.
to change the nameservers will either be simple or hard, depending on the domain name provider it might take 24 hours for them to change the name servers or they may allow you to change them via web UI which could be just a 2 hour wait.
My f7 Savannah watches from the window sill. Chirps and meows at each one. Gets scared shitless when the doorbell goes though!