The OP has options up to and including contacting financial attorneys and instruments regulators such as the SEC.

This means they are bundled together and turned into bonds, financial instruments that pay out interest (yield) to investors looking for a steady, fixed return.

You mentioned the semiconductor chip factories in Sherman and Denison (suburbs of Dallas), and I'm assuming you're referring to Texas Instruments building out and renovating new semiconductor fabrication factories, which is absolutely true.

Is this market accessible for the average investor in the UK, or is it exclusively banks and hedge funds who buy/sell these sorts of instruments?

A property that looks like a townhouse coupe be any of these 3.

From there while you are in escrow you'll need to have an attorney draft the promissory note and mortgage instrument.

Both FNMA and FHLMC permit this, under the following circumstances: Notes: For all such transfers affecting mortgage loans purchased or securitized by Fannie Mae on or after June 1, 2016, the transferee is not required to occupy the propertya limited liability company (LLC), provided thatthe mortgage loan was purchased or securitized by Fannie Mae on or after June 1, 2016, andthe LLC is controlled by the original borrower or the original borrower owns a majority interest in the LLC, and if the transfer results in a permitted change of occupancy type to an investment property, such change does not violate the security instrument (for example, the 12 month occupancy requirement for a principal residence).The servicer must notify the borrower that a property transferred to an LLC must be transferred back to a natural person prior to any subsequent refinance application in order to meet Fannie Mae’s Selling Guide underwriting requirements.Citation: D1-4.1-02: Allowable Exemptions Due to the Type of Transfer (04/13/2022)Now, you will still have the Note and reporting in your name individually and will still be personally responsible for the mortgage and most likely, the manner of transfer will enable any litigant to pierce the veil of your LLC, but you'll have what you wanted, for whatever reason. 

This means they are bundled together and turned into bonds, financial instruments that pay out interest (yield) to investors looking for a steady, fixed return.

The likelihood of all of these occurring is low in a typical subject-to transaction. its why way back in our day we did these with wraps CA has a debt instrument called an All inclusive Deed of Trust it wraps the orginal mortgage it is a second in function my dad had a company called CA wrap back in the day and did hundreds of them.. its de ja vu all over again.. he did this during the Carter interest rate spikes just like sub too is now coming to light in a big way because of interest rate spikes.. 

The person who owned it before me filed an affidavit of correction for a mortgage he had on the property and referenced an instrument number that had the wrong legal description.