Can't suggest which wedges you need but you are correct in assuming that you won't be able to get wedges with same meter speed as the rest of your set. I had those clubs for a very short time but sold them back and returned to the g10s then on to the i15s when they were released.
Same is the case for the i15s. Seems like they would develop them to accompany the most expensive clubs they offer. It has been brought up before but WGT doesn't seem to want to release any. Seems like they would be all over as another source of revenue.