Looking for a free/local tool to convert handwritten math formulas into rendered images and combine fragments

General
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I am looking for a tool or workflow for Linux that can convert handwritten mathematical formulas into clean, rendered, readable formulas, ideally without depending on paid services such as Mathpix.

I am not necessarily looking for a smart whiteboard that recognizes an entire page in real time. I understand that full handwritten mathematical expression recognition is difficult. Instead, I am thinking about a simpler and more realistic workflow:

  1. Write formulas by hand in an app such as Xournal++, Excalidraw, Rnote, or any digital whiteboard.

  2. Take small screenshots by sections: one fraction, one integral, one square root, one short equation, one matrix, etc.

  3. Send each screenshot to an application that recognizes the formula.

  4. Let the application internally convert the image to LaTeX, MathML, or another math format.

  5. Show the result directly as a rendered formula, not as code.

  6. Allow copying the result as an image, SVG, or transparent PNG.

  7. Ideally, provide a second panel or canvas where multiple rendered fragments can be arranged and combined into a larger expression or a complete math page.

Main goal:

Create or find an application with two panels:

  • Left panel: the original handwritten image or screen capture.

  • Right panel: the clean, rendered, readable mathematical result.

It would also be useful to have basic tools to:

  • accept or reject each fragment,

  • retry recognition,

  • copy the output as image/SVG,

  • move, align, and combine fragments,

  • export the final result as PNG, SVG, or PDF.

I am not necessarily looking for the user to see or write LaTeX code. LaTeX could be used internally, but the user experience should be visual: write, capture, convert, and obtain a clean formula.

I know projects such as pix2tex / LaTeX-OCR and Pix2Text exist, but I do not know of a free and polished application that combines fragment-based recognition, immediate rendering, and a canvas to assemble multiple sections.

Does anyone know of a free, local, or partially local tool that already does this?
Is there any project in development with this idea?
Would it be feasible to build a simple interface using pix2tex, KaTeX/MathJax, and a small screenshot tool?