That's an interesting suggestion!
This would, of course, be entirely unnecessary in the case of Verdana and Georgia, which are already very nice TrueTypes, but the bitmaps of Espy Sans could theoretically be fiddled with for a bit of fun. There is enough "out there," however, only to supply basic Roman letters for it in TrueType, which is not a lot of use, frankly, and I am not really interested in tinkering with beziers, as already stated, in order to supply umlauts and such; I reckon that this sort of thing is best left to those who know what they are doing.
However, just to keep the tinker wheels a-whirring, I have two basic questions that it looks you may be more able than most to answer:
1. Can bitmaps be used in conjunction with TrueType fonts? Or are they better suited to use in conjunction with Type 1 fonts? The latter looks like the likelier bet, but I may have the wrong end of this.
2. Would it be possible to map the bitmaps for Espy Sans, which I have, for the printer outlines and metrics of something else — say, for argument's sake, Hoefler Text if TrueType is OK, or some Adobe Postscript font if Type 1 is better — so that the typeface would display one way as a screen font but print differently? I would not have the slightest interest in WYSIWYG for these purposes, but only to have text in a word processor that both displays and prints exceptionally well.