Thanks to Softmaker for their response. I was able to find in TextMaker a way to make this app a nice, menu-driven application resembling their excellent desktop version. My whines now are limited to these:
-- There's peculiar behavior among embedded links, where a link is not just the linked text but all the text to the end of the paragraph when the document is opened in any other word processor.
-- TextMaker behaves unexpectedly when minimized, keeping the document but closing it and opening to a blank screen when maximized again. Strange, irritating, but seemingly nondestructive.
-- TextMaker behaves unpredictably when saving an edited document, sometimes simply saving it as expected but sometimes invoking the whole "save as" dialogue instead.
Wishlist item: it would be nice if there were keystroke combinations to perform common functions, especially when a hardware keyboard is used, though I understand that this might be difficult or impossible.
Another wishlist item: it would be nice to be able to just buy the thing. I'd happily pay even a fairly high purchase price, but I recoil at software rental.