It'd be nice to have a way to convert the liquid XP into "Bottle O' Enchanting", since a few mods use the bottles for recipes.

Hello,
I will think about adding some mechanic for the BOE as it would be a nice feature - even if if was just a right click interaction with the singularity tank with a bottle. I'm not sure if I would add a specific block for bottling XP but I will consider it. Thanks for the suggestion.
Cheers,
ME.

Simply right clicking on the tank with a bottle sounds like a great, natural mechanic.

This feature is now added and will be in the next update - be aware that using the xp tap is more efficient as a BOE will give a random amount of xp from 3 - 11 so, in order to mitigate a possible exploit, the bottle will always take 11 xp's worth of fluid xp from a tank.