Hi.
I always thought that the idea of Donjon is great but the rules always felt clunky. Now a player didn't arrive and we decided to have some old-school dungeoneering - with a streamlined bent.
And it worked quite well. Basically we made three changes to the rules:
1.) There is no Wherewithal stat. Roll Vir + Skill + Weapon DR to attack. Roll Adr + Skill + Armor DR for defense. Attack successes are substracted from flesh wounds directly. (Hence we called it Bloody Donjon.)
2.) There is no Initiative roll. Characters act in Discernment order (with usual rules for tie breaks). On his/her/its turn a character can act a number of times equal to his/her/its level.
3.) PCs and unique monsters get five additional starting dice.
The play in general was fun and combat even more so.