JEP 501[1] states that Zero will be still buildable for i386 platform:
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After the 32-bit x86 port is removed, the architecture-agnostic Zero port will be the only way to run Java programs on 32-bit x86 processors.
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Building Zero fails on i386 with the following error:

=== Output from failing command(s) repeated here ===
* For target hotspot_variant-zero_libjvm_objs_os_linux.o:
/build/reproducible-path/openjdk-26-26~22ea/src/hotspot/os/linux/os_linux.cpp:1831:6: error: #error Method os::dll_load requires that one of following is defined: AARCH64, ALPHA, ARM, AMD64, LOONGARCH64, M68K, MIPS, MIPSEL, PARISC, __powerpc__, __powerpc64__, RISCV, S390, SH, __sparc
 1831 | #error Method os::dll_load requires that one of following is defined:\
      | ^~~~~
/build/reproducible-path/openjdk-26-26~22ea/src/hotspot/os/linux/os_linux.cpp: In static member function ‘static void* os::dll_load(const char*, char*, int)’:
/build/reproducible-path/openjdk-26-26~22ea/src/hotspot/os/linux/os_linux.cpp:1842:9: error: ‘running_arch_code’ was not declared in this scope; did you mean ‘running_arch_index’?
 1842 | if (running_arch_code == arch_array[i].code) {
      | ^~~~~~~~~~~~~~~~~
      | running_arch_index

* All command lines available in /build/reproducible-path/openjdk-26-26~22ea/build/make-support/failure-logs.
=== End of repeated output ===

[1] https://openjdk.org/jeps/501