There is no technical reason as to why you need UEFI to use a TPM.
You have a business laptop, so you should call dell and insist to speak
to an engineering team member who can remedy that.
Note: it may be difficult if you don't have the us based pro-support as
the low wage outsourced techs will have no idea what you mean.
I would also insist on linux touchpad drivers, which again you can do
(because it is a business laptop)