Asset catalog: listings without price history can be matched, and there's no way to fix or re-source them

During the Portfolio Performance import, the review offered two matches for one of my assets (ISIN US09175A2069): the US listing in USD and a EUR listing found by its ISIN. I hold the EUR listing, so I picked that one. It turned out to have no price history at all, so the position has no value over time.

Several things are wrong here:

1. The review lets me pick a listing with no prices, without any warning. If a listing has no price history, the review should say so before I choose it.
2. I can't fix it afterwards. There's no way to re-match those transactions to another listing, or to the same asset from another source.
3. I can't attach a price source. Other apps let me edit a security and choose its price provider (for example Yahoo Finance, which has this EUR listing with full history). Here, if the internal catalog lacks prices, the only workaround is a custom asset with manual price files.

The incomplete internal catalog is one of the weakest parts of the app for me, and one that most needs improving. The rest works well, but I can't fully rely on it if I can't control where an asset's prices come from or fix a wrong match.