Is it possible to Change TRP for Employment purpose To EU Blue Card

Hi Everyone...
I am Vishal From India.
I am PLC Automation Engineer with around 11 years of experience.

I have applied for TRP Employment purpose in Slovak embassy in India.
But now my job location will be in Germany or other European countries. So, I contacted Slovak Embassy to change the Visa type From Employment to EU Blue card. But embassy said its not possible to change after document submission.

So, I would like to know,
1. Is it possible to change the visa type from employment to EU Blue card after entering in Slovakia with employment visa?
2. How much time will it take?

Thank you...

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