It’s not perfect, but you can put the amount where you want to have the currency drop-down in a span with the same class as defined in “Amount Selector”, and activate “Currencyr for jQuery”.
If you use “amount” in “Amount Selector”, then it would be like this:
<span class="amount">123456789</span>
Then edit the currencyr.min.js, look for the first occurrence of click and replace it with hover.