I must be transparent that, as a volunteer advisor in this forum, we do not have the authority to make decisions regarding the open-sourcing of legacy tools or the allocation of resources for their rebuild. These types of decisions are made by the respective product teams based on broader business strategy, user demand, and technical feasibility.
However, to ensure your voice is heard by the correct decision-makers, I strongly encourage you to formally submit this request through the official Microsoft Developer Feedback channels. The most direct way to influence the product roadmap is to post your suggestion on the Developer Community forum. You can search for "Font Tools" or "VOLT" and add your request there, or create a new post. This platform is actively monitored by our product groups, and having the request there allows other developers to upvote it, which significantly increases its visibility and priority.