PXE boot for 32-bit OS image deployment ConfigMgr 1910

Hi All

Ran into an issue with a customer last week and just wondering if anyone has any ideas.

Customer currently deploys 64-bit Windows 10 using ConfigMgr through PXE boot configured through one of the DPs. All working well. 

The customer has a requirement to use 32-bit OS deployed also through PXE however I have noticed that when a UEFI 64-bit machine boots it only receives the x64 boot image.

I have configured a specific task sequence to install 32-bit OS and have also specified the x86 boot image for that particular TS but my issue is when the machine reaches out to the PXE server it loading straight the x64 boot image.

I have tried to adjust the settings on the client machine in UEFI such as turn off secure boot, choose legacy BIOS but have not been successful. 

Ideally for the 32bit deployment the customer wants to leverage the task sequence steps that apply for 64-bit on the 32-bit machine such as BitLocker, would that be possible?

Any advise on setup on the client machine and how to get the machine to boot the x86 boot image would be grateful. The machines in question are fairly recent Lenovo laptops. I have asked the client to check their Iphelper options and/or DHCP options to see if a 32-bit boot image is defined....

Thanks