"Though", "although" and "if" can be straightly followed by adjectives or prepositional phrases:
e.g. Though with many pages, the book does not have a prologue.
e.g. Although not beautiful, she participated in a pageant/ beauty contest.
e.g. If possible, please avoid it from happening again.
I wonder if the above also applies on "even though" and "even if".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
I don't know if it is grammatical to do so even if I try to put the two to the examples
That's why I asked you to try.
I guess it means they work?
Yes, that's exactly what I meant. Write some example sentences using the construction you are querying, post them here and then we will tell you if they're grammatical.
Now I know that "even if" can go with adjectival phrases, noun phrases and prepositional phrases.
As for "even though", the following are few examples:
Even though not beautiful, she participated in a pageant.
Even though without enough time, he still managed to answer 8 out of 10 questions.
It was an unequal marriage, even though a stable and long-lasting one.
Even though not quickly enough, she still finished the whole race.