Believe Switzerland requires KYC, up to you if it's a hassle or it

I saw esim.dog has 3 network support (salt, sunrise, swisscom) and exits UK/NL, and not too bad price 10GB $6... But haven't used it, and same caveats (their network list may be outdated) , and you'll need another esim for Austria

Or get wingo plus one of the payg esims. Those would connect to salt/sunrise if needed, plus backup whenever you need a small amount of data (eg transit or layover). Esim.sm, unisim, Roamless, nxtlmobile, there are a few now

Just for your price comparison: You shouldn't be paying more than $1-2/GB for a travel EU esim ($1.5-4 for payg). Country specific esim would even be cheaper, or a local Euroepan esim that does EU roaming