What you can do? Think bigger.
http://ec.europa.eu/competition/cartels/overview/factsheet_fines_en.pdf
I am mentioning this, because our BURST Wallet is facing a similar issue. Of course having the App on Google Play is no problem.
If Apple will not comply, we are prepared to call the Directorate-General for Competition
(http://ec.europa.eu/dgs/competition/index_en.htm)

Also, users may be entitled to call the EC
for "Unfair commercial practices", because we believe by barring
access to alternate payment channels Apple conducts unfair
business-to-consumer commercial practices which are prohibited in the
European Union.
http://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=LEGISSUM:l32011

ad 3.1.5

There is no such thing as "approved virtual currencies". Apple is in
no position to make this approval. Apple especially is in no position
to hinder usage of cryptocurrencies for whatever reason, or worse:
to protect their own payment system "Apple Pay".