In general, I may be interested on a 1:1 change with other boss mats (details to be discussed IG).
Let me just point out that, in my opinion, you are looking for some of the most looked after boss mats, and unless you'll find someone who wishes to trade at those prices, you may want to review them (no offense meant, just a crafter sharing her PoV): currently, grind mats are valued around 10k q250, offering 100k per mat seems low with current market dynamics (10 grind mats for a yelkoo moss? or in other words, 5 M for 50 moss?). I would think it may be difficult.
Sorry to hijack this thread a bit, (against my "don't want , don't post" policy), but personally I am only interested in 1:1 exchange agains jewel boss mats (e.g. madakoo / yelkoo 'rooms, plodekya eyes, etc.)