I talked with Sally Prasch about your question. Glass torches are common in the scientific glassblowing world. However, they are generally made of quartz (fused silica) rather than borosilicate glass.
Blue Flame Technology is one source for quartz torches and torch parts: https://www.blueflametech.com/
They may have a blueprint available for your use.
Another source for quartz torches is Herbert Arnold: https://www.arnold-gruppe.de/en/burners.html or https://www.arnold-gruppe.de/nc/photovoltaik-halbleiter.html
If you are interested in working with quartz, these resources may be useful: https://www.ilpi.com/glassblowing/techdata.html#links
I hope this information is useful. Please let me know if you would like additional information. For example, this article may be useful:
Title: Fused Quartz Working Techniques. Published in: Glass-Sci, v. 14, no. 3 (Nov. 2007), pp. 4-6, ill. 0016-3155 Notes: Journal of the Scientific Glassblowers Society of Australia and New Zealand. Techniques on how to handle and work with fused quartz. Call Number: PER TP859.2 .A93
