UK taxation of US conduit trusts

Further to my recent post on inheriting IRAs, I also have a regular US investment account with uk non-reporting mutual funds and I have named UK citizen residents as the beneficiaries. If I was to create conduit trusts for the benefit of my UK beneficiaries and leave the money to that trust how would HMRC tax any money they receive from that trust?

I know nothing about conduit trusts except what I can find on the web.  Can non-retirement accounts/assets be put into a conduit trust? Maybe another type of trust would be required for non-retirement assets?  In the UK when equity funds are passed to a beneficiary they are not stepped up in basis so the beneficiaries will be liable to capital gains tax when they do sell the shares, and since there is an exemption of £12.3k every year on the capital gains it would certainly be more tax efficient if beneficiaries could receive the shares as shares instead of having them cashed out immediately.

For trusts the cap gains have a lower allowance.

Capital Gains Tax allowances
You only have to pay Capital Gains Tax on your overall gains above your tax-free allowance (called the Annual Exempt Amount).

The Capital Gains tax-free allowance is:

You only have to pay Capital Gains Tax on your overall gains above your tax-free allowance (called the Annual Exempt Amount).

The Capital Gains tax-free allowance is:

£12,300
£6,150 for trusts

https://www.gov.uk/capital-gains-tax/allowances

I know nothing about conduit trusts except what I can find on the web.  Can non-retirement accounts/assets be put into a conduit trust? Maybe another type of trust would be required for non-retirement assets?  In the UK when equity funds are passed to a beneficiary they are not stepped up in basis so the beneficiaries will be liable to capital gains tax when they do sell the shares, and since there is an exemption of £12.3k every year on the capital gains it would certainly be more tax efficient if beneficiaries could receive the shares as shares instead of having them cashed out immediately.

For trusts the cap gains have a lower allowance.

Capital Gains Tax allowances
You only have to pay Capital Gains Tax on your overall gains above your tax-free allowance (called the Annual Exempt Amount).

The Capital Gains tax-free allowance is:

https://www.gov.uk/capital-gains-tax/allowances

Yes, it's a tricky area. Of course one approach would be to sell everything myself before I die.