understood, it’s a leap of faith to go visit an embassy in a foreign country without clear details. Point is to provide evidence that you are eligible via 1) legit income source 2) authorized remote work.
If you have more proof than they ask, I see no reason they will deny your application.
I believe someone pays you for your services so you can write a draft letter yourself for that client to sign.
If you can’t find one person to be that person, you can probably write a self declaration. But hey, you should be asking this to the embassy you’re gonna apply.
Yeah you're right. I wouldn't dare doing that. We know for a fact that immigration and MFA's digital systems are improving year after year. They likely know entry/exits of every fingerprint owner.
ask the place you’re going to apply. You should be not lazy to provide them MORE proof than what they ask for because after all, the staff wants to go through the checklist for each candidate and get on with their life.
If you provide them enough proof, they’ll appreciate your efforts and also more likely to approve you.
Don’t forget, once you get this, you don’t need to do a single visa applucation for 5 years straight.