Suggestion: Eldritch currency upgrade vendor recipe

Would it be broken to allow players to upgrade eldritch currencies?

For example: Three lesser eldritch currencies vendor into one greater eldritch currency of the same type. Same for greater to grand. No exceptional would be understandable though. I would even go for a stack of lesser plus an exalt vendors for three greater while a stack of greater and a divine vendors for three grands. That is how uncommon they are, that I would happily pay exalts and divines for them in SSF.

I haven't grinded out the bosses beyond the initial fights and I never really see greater or grand eldritch currencies drop, but I'm sitting on stacks of the lesser currency which no longer serves any purpose as I already have the lesser mods I want on my gear.

To me, it does not seem to make sense to have these currencies drop only or mostly from the bosses when they should be intended to be gear upgrade milestones on the way to fight those bosses.

Please consider this.

The lesser currencies are more useful than you may think. I've actually found often the cheapest way to get some mods to Exquisite or Perfect (or even Exceptional if that's as far as you want to go) is to roll it with the lesser currency, then orb of conflict it up. The reason is that the mod pool on lesser is MUCH smaller (it cuts out all the crappy "when a unique/pinnacle/etc. boss in in range" mods).

Also, only Exceptional is boss specific. If you farm Wrath of the Cosmos, you get crap tons of Grand currency (I walk out with 40+ per map that has the right altars).