It's a matter of life, life, and death.
First of all, you say “I don't want to do my own funeral,” but don't you think of your life as your own property?
and “Are there any denominations that have doctrinal problems if you don't have a funeral?” However, I think they have the feeling that it's because there is a penalty if you don't offer condolences, what do you think?
First problem. Your life is not yours. It was given to you by your parents, and those parents also received it from their parents. What gives one life is two lives, and those two lives are 4, plus 8, 16, 32, 64, 128, 256... I have received a baton touch of life from a tremendous number of ancestors, in other words.
The phrase “taking care of your ancestors,” as it is often said, means taking care of me.
A condolence issue. There is no physical guarantee or assertion that they cannot be done, such as being reborn in the Pure Land or being reborn as a good person.
Condolence means providing a place to thank, say goodbye, and listen to Buddhism for all the people you have met when you die, that is, the relationships that have formed your existence.
For example, you wrote on this site, and a relationship with me was born. Apart from whether you like it or not, you who didn't write here and you who wrote are different people. There are countless things like that in your life, and what exists due to relationships that go beyond such expectations is who you are right now.
Recently, neologisms such as family funeral have become popular, but I think that is a foolish act that cuts off the countless relationships that make up a person's life, makes that person's life itself light and small, and makes one not understand the weight and preciousness of life.
When you pass away in the Pure Land, you yourself are firmly accepting and aware of the fact that you have been born and kept alive through such countless relationships, and the words of that awareness will become you who can chant Namu Amida Buddha and that Namu Amida Buddha.
I think the desire to be tested is good, but I hope you can think deeply about life and life once again. Our school says, “Life is living for you now.” Life is the subject.
Gassho