I think it's a good bet. But you can get a little creepy looking at it this way: the previous 6 finals ended with a BTTS No 
Will the trend continue? I'm sure that in each of those 6 finals BTTS Yes was the favorite, so it will be strange if the underdog wins again for the 7th time. This argument might calm you down. In any case, as you say, this is a small bet for you, so no matter what the result, the most important thing is that the game itself turns out to be interesting.
Yes, it could be that the trend continues where the final this time is BTTS no - we know Inter Milan always score a large number of goals as well as PSG but when in the final we are difficult to determine it could be that there will be few goals scored or only one goal in the final match.Will the trend continue? I'm sure that in each of those 6 finals BTTS Yes was the favorite, so it will be strange if the underdog wins again for the 7th time. This argument might calm you down. In any case, as you say, this is a small bet for you, so no matter what the result, the most important thing is that the game itself turns out to be interesting.
Apart from small bets, it's not a problem to bet, it's just that I haven't done it yet, maybe when it's close I'll make a bet.
There is often no logic in final games, for example, who could have thought that in the games Bayern - PSG and Real - Liverpool the outcomes would be BTTS No. I don't remember that Covid final anymore, but I remember very well how Courtois made the result. If it weren't for him, it would definitely have been BTTS Yes. If you doubt, it is better to make a live bet, sometimes you can catch good odds. But if you do not want to be distracted by numbers and just enjoy football, it is better to make a bet in advance.