Applying for UK (and/or Schengen Visa) with 1 passport while I have 2

Turkish citizen. I will need to apply and will need passport for the following processes in the coming months:
- Ireland naturalization process (am legal resident)
- A Schengen Visa from the country I intend to visit (probably Spain/Portugal)
- A UK Visa
Now since the 1st process will take sometime, effectively holding my passport hostage, I will get a second Turkish passport (which is doable). I need to provide my original passport to the 1st process but not necessarily the newly issued one.
I intend to apply to the other 2 visa applications with a newly issued one, providing scans of my original passport and probably with a document supporting that I have my passport being held by the authorities.
Would this create any issues?
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Can you apply for UK and Schengen visa at the same time?
In fact, you can even possess a UK and Schengen visa together and visit one after the other. Although lucky for the Chinese people, they can literally apply for the UK and Schengen visa together on one application form.Can you apply for more than one Schengen visa?
A multiple-entry visa allows its holder to go in and out of the Schengen Area as many times as he or she wants, as soon as they do not violate the 90/180 rule. Based on how frequently you travel to Schengen zone, you may apply and obtain one of the following multiple-entry visa types: 1 year multiple-entry visa.Can I apply for two Schengen visas for different countries at the same time?
A Schengen visa, by definition, is for all Schengen countries, so you can't have two Schengen visas for different countries.Do we need separate visa for UK and Europe?
British citizens are covered by a Schengen visa waiver. This means you do not need to apply for a Schengen visa to visit these countries for up to 90 days in a 180-day period for: tourist travel. some business activities, such as attending meetings.REASONS WHY SCHENGEN VISA APPLICATIONS GET REJECTED (Highly requested)
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Images: Ethan Wilkinson, Nataliya Vaitkevich, Porapak Apichodilok, Karolina Grabowska