Well, this resource says that 1s and 7s get along and are opposite but also complementary.IDK, just imagine that pairing, or speak on your experience. How would this go down? Use your imaginations.
Might be interesting to watch, with popcorn, haha.
Also, this Enneagram combination seems to be a fairly common match.
ENFP/INTJ relationships are, also.
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I don't know much about 7s and 1s, to be frank.
I did have an INTJ-514 (5w4) comrade for a few years in high school; we got along fine.
From what I've experienced, relatively equal intelligence/maturity levels, and power-balance are more important.
Optimally, the INTJ should soften somewhat towards the ENFP.
The ENFP must be organized/productive independently, or at least possess some clear reasonability.
If both can "meet in the middle", they're more likely to reach a state of romantic success.