Inserting new spark plug tube seals into the valve cover ... anything better than beat them in?

Thank you Georgina! Sorry to not understand, but I do not have the proper foundations to know how to proceed.

Could someone please help translate? For example:
- what type of machine/industrial shop could do this? (ex one that specializes in POM? ... for what type of application ... automotive?)
- what artifacts would I need to bring with me so that they could understand? (rough drawing, drawing with dimensions, valve cover with example seal, just example seal, etc)
- would this be considered a "routine" or "exotic" request?
- guestimate of cost?

Basically, for the right person (Georgina) easy to do, but would others typically have the equipment and would they be inclined to undertake such a request? (Really wish I lived in SC but I'm in MN!)

 

Many thanks to you again Master Po as well as Georgina.

What worked for me in the end was trial and error: ordered a different brand of valve cover gasket + tube seals:
Beck Arnley 036-1887 Valve Cover Gasket Set
The tube seals were probably 0.4-0.75mm less in diameter and they popped in quite readily
Son swears that these aftermarket seals are the same as the original Toyota ones (pattern of ridges/markings).

Tried the above method with the new (superseded) Toyota part and Fel-Pro but had limited success.
The nigh impossible part for me was always getting the entire seal initially seated into the hole (i.e. seal is too big for the hole unless you deform it).
A heat gun worked to some extent - but because the rubber coating on the seal is basically "paint thick" it exposed the metal bands inside and this made it unviable.