Remove ID3v2 from FLAC files, Fix FLAC files - remove ID3v2 tags, and save only FLAC tags Options

[Evil Overlord1]

Most of my music library is in FLAC format. About a third of the FLAC files also have ID3v2 tags. I need a simple way to convert these tags to FLAC format.

I've tried the following:
TAG.exe - works, but very, very slow.
MP3Tag - very slow, removes album art from tag. Have to either load each folder individually, or load all folders (that is, you can't select artists A-D).
dbPowerAmp - slow, keeps album art, but no way to filter for only the files with ID3v2 (that I know of).
MusicBrainz Picard - works quickly, but with some drawbacks (can't tell when it's done).
Foobar2000 - I keep hearing about the tag rewrite option, but I sure can't find it in 1.0.1.

Ideally, I'd find a method that:
a) can work with selected folders (like dbPowerAmp, MediaMonkey, Picard)
b) shows the tag format (like MP3Tag) so that I can just work with the problem files
c) makes changes quickly
d) shows progress

for the moment, what I do is

1. Load all folders in MP3Tag, and filter for FLAC files only
2. Note which albums have the wrong tags
3. Load those folders in Picard, cluster them, and save them
4. Use MediaMonkey to check the timestamp for each album so that I can determine whether Picard is done. Alternatively, I reload MP3Tag (takes about an hour).

This is obviously unwieldy. Any suggestions welcome!