A nice page of generic stats would be handy to have. . .I know when I was converting HARP adventures to RM stats I just slapped up a crib sheet of levels down the left, and low/mid/high across the top.
Low = 1 rank every other level
mid = 1 rank every level
high = 2 ranks per level
Then all I had to worry about was if they had Level or stat bonuses or not, and I could mostly do those on the fly.
Took me a bit under an hour to mock up that table, which saved me a lot of time after that.
The really generic table ala FASERIP above does give quick answers, but to a degree, the level vs interest +/- stat bonus is more complicated in most situations.
Like, the 10th level mage, likely not a combat monster, but likely did either 1/2 level in ranks with their weapon, or level ranks in their weapon. . .a 10th level mage may have an OB with staff akin to 3-4th level fighter OB with sword.
So rather than the above, I'd likely go with a level vs ranks/level table, then assume a certain amount of blurring of those numbers due to talents/stats.
so you could look at it, say "10th level fighter, how good with a sword?"
go to the 10th level line, slide over to the 3 ranks/level column, then add 10-30 for stat/talent/professional mods.
Not quite as quick and easy, but your example above might just be a bit too quick and easy.