I just watched this the other day, on the Ainslie bullion website.
I also emailed Paul from Ainslie, requesting he look into accepting steem/SBD for bullion purchases.
I know Hive account@phelimint is doing so, which will come in handy for the steem coins, but I'd rather not deal with Customs if I don't have to.

His response was encouraging.

Yes, we are looking at expanding our offerings and steem is certainly on the list for consideration.

We are also looking at our systems and liquidity solutions for such non 'mainstream' coins and new offerings will be made once that project is under our belt.