Hi Huckster,
The legislation about protecting pension assets came about after the Robert Maxwell scandal after he had plundered the Mirror Group pension.
However, I am not talking about taking money out of a pension at all. The loan is an asset of the pension, just like a managed fund or with profits fund might be. The loans are only available from a specialist pension, which are generally only used by company directors as you can only have a maximum of 11 members.
There is no need to wait for legislation to be passed or changed as there is already a specialist pension which exists whereby the loanback is a permitted asset. It is called a Small Self-Administered Scheme (more commonly known as a SSAS) I've been working with these types of pensions with company directors since the mid 1990's so am very experienced with these types of pensions - hence my username! They are basically the company pension version of the SIPP (Self-Invested Personal Pensions) which have been in the news over the last few years.
The earliest that you can take your pension benefits from a personal or occupational pension is now 55. There are certain times, such as serious ill health as you mentioned, when you can take it earlier.
Also, the pension scheme trustees should not be able to prevent you from taking early retirement (at age 55) although your annual pension entitlement will be reduced. If you imagine that your pension fund is a large cake and each slice represents a slice of annual pension income; the earlier you take the pension the more slices you will have so the thinner they will need to be.
I personally would be reluctant to sell a share of my company to outside investors unless there was no other way as you would be giving up a share of control and future profits.