Hello,
It's the first time I post on this forum, so please, bear with me ....
About PCI to ISA cards, ** possibly ** with DMA :
Did you check theses guys :
http://www.costronic.com.tw/
They manufacture lot of "interface" boards ( PCI, ISA, etc ... )
and have a lot of things, may be there is something of interest for you ?
( I mean : with DMA )