Advice for modifying for web comic project?

Awesome plugin. But how would I achieve these things?
• Remove the numbering system
• Maintain First Page and Last Page buttons even when on those pages

Reasoning:
A web comic theme would be made up of single posts (in a specific category) containing single pages of a sequential set of pages. Page 1 is posted first, making the numbering system the opposite of the content (i.e. when on Page 1 the highlighted page would be the largest number, not “1”, which is counter-intuitive).
A user pages through the comic keeping the cursor over the Next Page button. Ideally the nav buttons would maintain their position.

Thanks in advance!

https://ww.wp.xz.cn/plugins/simple-pagination/