Not sure whether they accept eth addresses either but there's no reason why they shouldn't when they can be verified online.
@OP in case that ETH address gets rejected, you can use a BTC address you posted for Enigma Catalyst sig camp
the address seems unused but you may still have its private key to proof ownership
I quoted below and saved here
http://archive.fo/rxjsw#selection-4761.0-4761.10 Bitcointalk username: loremipsum
Rank: Sr. Member
Current post count: 608
Bitcoin address: 1DLMTFP8BHoJFDiDwE9rNdBjcar6WXajKU
I'm also a member of Enigmarines.