You can still use your visa/mastercard to buy bitcash on sites like playasia or seagm (whichever has less markup rate), then use bitcash to buy tora coins, then use tora coins for fantia.I've noticed that there's only request of this artist
https://fantia.jp/fanclubs/494061
they have some really nice animations (especially the BA once from the preview.)
I would love to see someone to bring out the full BA videos in a collection. thank you! (I would have done it but my card won't work in JP sites)
It's a hassle, there's a 1000 yen minimum purchase, the markup rate is high, and fantia's system sucks donkey ball in general, but the option is there if you really want it.